2025–26 South-West Indian Ocean cyclone season

2025–26 South-West Indian Ocean cyclone season
Season summary map
Seasonal boundaries
First system formed16 July 2025
Last system dissipatedSeason ongoing
Strongest storm
NameHoracio
 • Maximum winds215 km/h (130 mph)
(10-minute sustained)
 • Lowest pressure935 hPa (mbar)
Seasonal statistics
Total disturbances12
Total depressions11
Total storms9
Tropical cyclones5
Intense tropical cyclones4
Very intense tropical cyclones0
Total fatalities78+
Total damage> $142 million (2026 USD)
Related articles
South-West Indian Ocean tropical cyclone seasons
2023–24, 2024–25, 2025–26, 2026–27, 2027–28

The 2025–26 South-West Indian Ocean cyclone season is the current annual cycle of tropical cyclone and subtropical cyclone formation in the South-West Indian Ocean. It officially began on 15 November 2025, and will end on 30 April 2026, with the exception for Mauritius and the Seychelles, for which it will end on 15 May 2026. These dates conventionally delimit the period of each year when most tropical and subtropical cyclones form in the basin, which is west of 90°E and south of the Equator. However, tropical cyclones can form year-round with any cyclone forming between 1 July 2025 and 30 June 2026, such as 01, Awo, Blossom and Chenge, also part of the season. Tropical and subtropical cyclones in this basin are monitored by the Regional Specialised Meteorological Centre in Réunion and unofficially by the Joint Typhoon Warning Center.

Seasonal forecasts

Record Moderate
Tropical Storm
Tropical Cyclone
Average 10 5
Record high 15 (2018–19) 11 (2018–19)
Record low 3 (1982–83) 0 (1982–83)
Forecast
center
Systems
Météo-France 10–14 5–8
Mauritius Meteorological Services 11–13 N/a
Forecast
center
Chance of
below/near/above average
Météo-France 10% 40% 50%
Sources:[1][2]

Seasonal summary

Cyclone GezaniTropical cyclone scales#Comparisons across basins

Pre-season/early season activity

The season began with the crossover of a tropical low from the Australian basin on 16 July. The low was designated Tropical Depression 01 by Météo-France, while the JTWC designated the depression as Tropical Storm 01S a little later.[citation needed] The system did not strengthen and dissipated 2 days later without affecting land. On 7 August, a tropical disturbance formed well north of the Mascarenes, later that day it was upgraded to a tropical depression then subsequently named Awo that evening as it strengthened into a Moderate Tropical Storm. Awo was the first named storm to form in August within the South-West Indian Ocean basin since Severe Tropical Storm Aline in 1969, though Severe Tropical Storm Tony did enter the basin during August in 1979. Awo only briefly survived, encountering high shear and dissipating the next day. On 7 September, Météo–France started monitoring a disturbance south of Diego Garcia. Briefly on 9 September, it intensified into a tropical depression. The system was then classified as a Moderate Tropical Storm and named Blossom, becoming the second named storm of the season. Blossom maintained its intensity in a marginal environment, before degenerating into a remnant low–pressure area on 11 September. On 17 October, a low–pressure area formed near Diego Garcia and was marked by Météo-France as the fourth Zone of Disturbed Weather of the season, the fourth off-season system of the season. After strengthening into a Moderate Tropical Storm, it was named Chenge. Heading westward, the cyclone further strengthened into a Severe Tropical Storm on 22 October before weakening. On 25 October, Chenge degenerated into a remnant low off the coast of Tanzania. Following these early and off-season systems, the basin experienced a prolonged period of inactivity leading into the official start of the season. Activity resumed on 27 December when Tropical Cyclone Grant entered the South-West Indian Ocean from the Australian region, retaining its name as it crossed basin boundaries. Grant dissipated in early January after rapidly intensifying into an Intense Tropical Cyclone in the central part of the basin, far from land.

Peak season activity

On 10 January, Cyclone Dudzai developed in the central part of the basin, becoming the second intense tropical cyclone of the season. Dudzai’s formation marked a transition to more typical mid-season conditions, characterized by warmer sea-surface temperatures and reduced wind shear, which supported stronger and more sustained cyclonic development within the basin.[3] Dudzai then weakened quickly immediately after intensifying, before accelerating westward and quickly intensified once again, before becoming extratropical as it recurved away from land. While it was dissipating, on 20 January, Ewetse formed and quickly made landfall in southwestern Madagascar as a Moderate Tropical Storm the next day. Eight days later, Fytia formed and rapidly intensified before making landfall in northwestern Madagascar as a high–end Tropical Cyclone on 31 January. After crossing Madagascar, it dissipated south of Réunion. twelve were killed in Madagascar from the storm. On 8 February, Gezani was named. It slowly strengthened and became a Severe Tropical Storm the next day.

Systems

Tropical Depression 01

Tropical depression (MFR)
Tropical storm (SSHWS)
 
Duration16 July (Entered basin) – 18 July
Peak intensity55 km/h (35 mph) (10-min);
1000 hPa (mbar)

On 16 July, a tropical low moved from the Australian Region into the South-West Indian Ocean, where it was classified as Zone of Disturbed Weather 01 by Météo-France. On the same day, the JTWC upgraded the system to a tropical storm, assigning it the designation 01S.[4][5] The system moved west-southwestwards into an increasingly unfavourable environment, dissipating on 18 July.[6]

Moderate Tropical Storm Awo

Moderate tropical storm (MFR)
Tropical storm (SSHWS)
 
Duration6 August – 8 August
Peak intensity75 km/h (45 mph) (10-min);
1000 hPa (mbar)

On 6 August, a tropical disturbance formed in the central Indian Ocean. A day later, the JTWC designated the system as Tropical Storm 02S, while MFR designated the system as Tropical Depression 02. Six hours later, Mauritius Meteorological Services upgraded it to moderate tropical storm status and named it Awo.[7] Awo is the first named storm to form in August within the South-West Indian Ocean basin since Severe Tropical Storm Aline in 1969, though Severe Tropical Storm Tony did enter the basin during August in 1979.[8][9][10]

Moderate Tropical Storm Blossom

Moderate tropical storm (MFR)
Tropical storm (SSHWS)
 
Duration9 September – 12 September
Peak intensity65 km/h (40 mph) (10-min);
1003 hPa (mbar)

Meteo-France Réunion began monitoring a disturbance on 7 September. At 10:00 a.m. (0600Z) on 9 September, MFR upgraded it to Tropical Depression status, marking it as Tropical Depression 03.[11] By the next advisory it weakened back to a Tropical Disturbance. On 10 September it once again intensified into a Tropical Depression. On 11 September, it strengthened once again, this time strengthening into a Moderate Tropical Storm, thus receiving the name Blossom. It weakened shortly after and dissipated the next day.[12]


Severe Tropical Storm Chenge

Severe tropical storm (MFR)
Tropical storm (SSHWS)
 
Duration17 October – 25 October
Peak intensity95 km/h (60 mph) (10-min);
985 hPa (mbar)

On 17 October, a low–pressure area formed near Diego Garcia and was marked by Météo-France as the fourth Zone of Disturbed Weather of the season. It was then classified as Moderate Tropical Storm Chenge. Early on 22 October, Chenge intensified into a Severe Tropical Storm. Chenge then went on to move in a mostly western trajectory, passing north of Madagascar before entering increasingly unfavorable conditions and weakening into a tropical depression. Chenge dissipated on 25 October.[13]

Intense Tropical Cyclone Grant

Intense tropical cyclone (MFR)
Category 4 tropical cyclone (SSHWS)
 
Duration27 December (Entered basin) – 6 January
Peak intensity205 km/h (125 mph) (10-min);
944 hPa (mbar)

On 27 December, Grant entered the basin from the Australian Region at 10:00 RET (06:00 UTC) as a severe tropical storm.[14] Twenty-four hours later, the system became a tropical cyclone.[15] After rapid intensification, Grant was upgraded to an intense tropical cyclone at 0:00 UTC on December 29, equivalent to a Category 3 hurricane on the Saffir-Simpson scale, about 1300 km southeast of Diego Garcia, the first major cyclone of the season in the South-West Indian Ocean Basin.[16][17] At 15:00 UTC, the Joint Typhoon Warning Center (JTWC) upgraded it to category 4.[18] Grant remained at slightly below its peak intensity for more than 42 hours before weakening back to a tropical cyclone, according to RSMC La Réunion, on December 31 at 12:00 UTC, as it entered an area of dry air and upper-level wind shear. It was then 900 km east-northeast of Rodrigues.[19] On January 1, 2026, at 6:00 UTC, Grant was downgraded to a severe tropical storm and then to a moderate tropical storm 6 hours later, more than 600 km northeast of Rodrigues.[20] The next day at 12:00 UTC, the system was downgraded again, this time to a tropical depression.[21] On Sunday, January 4th, the center of the system passed about 85 kilometres (53 mi) North of St. Brandon, bringing bands of heavy showers and thunderstorms with swells of 3 to 4 meters.[22] On January 5, the Regional Specialized Meteorological Centre (RSMC) La Réunion issued its final bulletin for Grant, which had weakened into a tropical disturbance passing between 50 and 100 km southeast of Tromelin Island. The remnants of the system were heading towards the southern coast of the Toamasina Province in Madagascar, which it was expected to reach within two days.[23]

Intense Tropical Cyclone Dudzai

Intense tropical cyclone (MFR)
Category 4 tropical cyclone (SSHWS)
 
Duration10 January – 21 January
Peak intensity205 km/h (125 mph) (10-min);
937 hPa (mbar)

At 12:00 UTC on 10 January, the RSMC La Réunion estimated that a tropical disturbance it had been monitoring for a few days was sufficiently organized to be declared a tropical depression at 800 km southeast of the Chagos Archipelago.[24] Later that day, it was given the name Dudzai as it intensified into a moderate tropical storm. Dudzai would then strengthen into a severe tropical storm the following day. By 12 January, it had rapidly intensified into an intense tropical cyclone.[25] Dudzai then encountered less favorable conditions and its very slow movement produced an upwelling of cooler water from the depths, all leading to a gradual weakening. On 13 January, its trajectory also turned westward.[26] On 14 January, the system temporarily weakened back to a strong tropical storm, while accelerating towards the Mascarene Islands, before returning to a tropical cyclone with an improvement in environmental conditions.[27] On 15 January, Dudzai restrengthened into an intense tropical cyclone and increased its gale-force wind radius. On 16 January, Dudzai reached its second peak intensity with maximum sustained winds of 195 km/h and a minimum central pressure of 945 millibars. Soon after reaching its peak intensity the cyclone began to weaken due to an eyewall replacement cycle. On 17 January, Dudzai weakened back into a severe tropical storm and a cyclone warning was issued for Rodrigues island by the Mauritius Meteorological Services.[28] On 18 January, the center of the system moved approximately 180 km southeast of the island where Air Mauritius had cancelled all flights to and from Rodrigues.[29][30] The storm then passed approximately 300 km southeast of Réunion and Mauritius, both of which were placed on weather warning due to the effects of the cyclonic swell on sea conditions and potential of coastal flooding.[31] Subsequently, Dudzai's track curved southward and then southeastward, and on 21 January, it passed south of the 30th parallel south, reaching colder waters and becoming extratropical, eventually merging with a frontal boundary.

Moderate Tropical Storm Ewetse

Moderate tropical storm (MFR)
Tropical storm (SSHWS)
 
Duration20 January – 21 January
Peak intensity85 km/h (50 mph) (10-min);
995 hPa (mbar)

On 20 January, MFR started monitoring a non-tropical low pressure area along a frontal boundary in the southern Mozambique Channel for possible development. Later that day it was upgraded into a tropical depression. A few hours after that, it was upgraded to Moderate tropical storm, thus receiving the name Ewetse. The storm made landfall near Itampolo shortly after 6:00 UTC on the 21st and weakened rapidly over the mountainous terrain as it moved north. The RSMC La Réunion issued its final bulletin at 12:00 UTC.[32]

In Mozambique, although the storm’s centre remained offshore, Ewetse’s outer bands exacerbated a severe humanitarian crisis. The country was already under a national red alert due to weeks of torrential rain that had flooded the Limpopo and Incomati river basins. The storm generated a storm surge of 0.7 m (2.3 ft) near Ambanhe and brought additional heavy rainfall to the Gaza and Inhambane provinces, where over 600,000 people had already been affected by flooding.[33]

In Madagascar, Ewetse primarily impacted the Toliara Province. While wind damage was limited, the system delivered significant rainfall, with totals exceeding 150 mm (5.9 inches) in local areas. These rains triggered flash flooding in the southern districts, though they were also noted for providing some relief to regions that had been suffering from prolonged drought. No fatalities were directly attributed to the storm's landfall, but local authorities remained on high alert as the system moved through areas with high vulnerability and poor drainage infrastructure.[34][35][36]

Tropical Cyclone Fytia

Tropical cyclone (MFR)
Category 3 tropical cyclone (SSHWS)
 
Duration29 January – 4 February
Peak intensity155 km/h (100 mph) (10-min);
965 hPa (mbar)

On 28 January, Météo-France (MFR) began tracking an area of low pressure, designated as Zone of Disturbed Weather 09, located in the Mozambique Channel. The system formed along a convergence zone between the Comoros and the northwest coast of Madagascar over very warm waters with light wind shear. The disturbance was relatively shallow with a disorganized cloud pattern, a peak 10-minute sustained winds of 45 km/h (30 mph) and a minimum central pressure of 1009 hPa. It was expected to turn toward Madagascar.[37] On January 30, 09 was upgraded to a moderate tropical storm, giving it the name Fytia. Fytia later went through rapid intensification, becoming a tropical cyclone after 12 hours. The cyclone reached a peak intensity of 155 km/h (100 mph) and 965 hectopascals (28.50 inHg) as it made landfall near Soalala around 01:30–02:00 UTC on 31 January.[38][39] The system became the strongest cyclone to make landfall in Mahajanga province since Andry in 1983, equal to Belna in 2019.[40] Upon crossing Madagascar, the system had weakened considerably. However, after re-emerging over the open Indian Ocean, Fytia began to strengthen once more on 2 February. This window of intensification was short-lived, as the system became disheveled on the following day, and ultimately degenerated into a remnant low later that day.

Fytia left 14 people dead[41] and seven others injured in Madagascar. Significant flooding considerably damaged northern parts of the island, affecting more than 70,000 people and displacing nearly 28,000.[42]

Intense Tropical Cyclone Gezani

Intense tropical cyclone (MFR)
Category 3 tropical cyclone (SSHWS)
 
Duration4 February – 18 February
Peak intensity185 km/h (115 mph) (10-min);
953 hPa (mbar)

On 4 February, Météo-France began tracking an area of low pressure, designated as Zone of Disturbed Weather 10.[43][44] It was then upgraded to a Tropical Depression on 6 February, and then upgraded to a Moderate Tropical Storm on 8 February, earning the name Gezani. After that it rapidly intensified to become the third intense tropical cyclone this season, and made landfall on Toamasina, Madagascar at peak intensity on 10 February.[45] Gezani quickly reemerged back into the Mozambique Channel as a moderate tropical storm after it made landfall on Madagascar, it rapidly reorganized and reintensified into a Tropical Cyclone, and then reached Intense Tropical Cyclone status for the second time while skimming Mozambique. As it moved southeast away from Mozambique, it started to weaken, and then curved northeast towards southern Madagascar. It rapidly weakened to a moderate tropical storm and then back to a tropical cyclone as it neared Madagascar again, until it curved southeast and weakened to a severe tropical storm, not making landfall.

In Toamasina, buildings and walls collapsed, power poles and trees were downed, and roofs were blown off buildings.[46] At least 35 deaths, six missing and 374 injuries were recorded, with over 3,200 homes damaged or destroyed and 8,8000 people displaced.[47][48] Malagasy president Michael Randrianirina said 75% of Toamasina had been destroyed by the storm.[49]

Intense Tropical Cyclone Horacio

Intense tropical cyclone (MFR)
Category 5 tropical cyclone (SSHWS)
 
Duration18 February – 25 February
Peak intensity215 km/h (130 mph) (10-min);
935 hPa (mbar)

On 19 February, a low-pressure system that formed in the middle of the Southern Indian Ocean consolidated into a tropical depression; being assigned 22S by the JTWC.[50] After some gradual organization on 20 February, the depression strengthened and it was named Horacio. It initially struggled to strengthen despite existing in a favourable environment, but the storm began strengthening on 21 February into the following day. On 23 February, Horacio reached its peak intensity as a Category 5 tropical cyclone on the Saffir-Simpson scale (SSHWS), becoming the first tropical cyclone of that intensity of the year, the first to do so in the South-West Indian Ocean basin since Djoungou of the 2023-24 season, and the first in the Southern Hemisphere since Errol achieved that status off the coast of northwestern Australia in April 2025.[51][52][53][54] This was then followed by a rapid weakening trend; Horacio quickly lost its Category 5 status.[55] The storm would continue to unravel as it dove southward, ultimately losing tropical cyclone status on 25 February. The system continued in the same general direction, weakening and eventually transitioning into an extratropical low.[56]

Tropical Depression 12

Tropical depression (MFR)
 
Duration13 March – Present
Peak intensity55 km/h (35 mph) (10-min);
1002 hPa (mbar)

Other systems

  • Cyclone Jenna crossed into the basin from the Australian region on 8 January as a residual depression, according to MFR. However it weakened quickly and was downgraded to a remnant low on the same day. MFR would then not issue specific bulletins for it.[57]
  • On 27 January, Météo-France (MFR) began monitoring a broad area of low pressure situated to the east of Madagascar, designating it as Zone of Disturbed Weather 08. The disturbance brought increased cloudiness and scattered squalls to parts of Madagascar and the Mascarenes as it continued to be monitored for further organisation.[58] It dissipated over the water on 28 January, merging with a monsoon trough.[59]

Storm names

Within the South-West Indian Ocean, tropical depressions and subtropical depressions that are judged to have 10-minute sustained windspeeds of 65 km/h (40 mph) by the Regional Specialized Meteorological Centre on Réunion island, France (RSMC La Réunion) are usually assigned a name. However, it is the Sub-Regional Tropical Cyclone Advisory Centres in Mauritius and Madagascar who name the systems. The Sub-Regional Tropical Cyclone Advisory Centre (Mauritius Meteorological Services) in Mauritius names a storm if it intensifies into a moderate tropical storm between 55°E and 90°E. If instead a cyclone intensifies into a moderate tropical storm between 30°E and 55°E then the Sub-Regional Tropical Cyclone Advisory Centre (Meteo Madagascar) in Madagascar assigns the appropriate name to the storm. Storm names are taken from three pre-determined lists of names, which rotate on a triennial basis, with any names that have been used automatically removed. New names this season are: Awo, Blossom, Chenge, Dudzai, Ewetse, and Fytia, which replaced Ashley, Balita, Cheneso, Dingani, Enala, and Fabien during the 2022–23 season.[60]

  • Awo
  • Blossom
  • Chenge
  • Dudzai
  • Ewetse
  • Fytia
  • Gezani
  • Horacio
  • Indusa (unused)
  • Juluka (unused)
  • Kundai (unused)
  • Lisebo (unused)
  • Michel (unused)
  • Nousra (unused)
  • Olivier (unused)
  • Pokera (unused)
  • Quincy (unused)
  • Rebaone (unused)
  • Salama (unused)
  • Tristan (unused)
  • Ursula (unused)
  • Violet (unused)
  • Wilson (unused)
  • Xila (unused)
  • Yekela (unused)
  • Zaina (unused)

If a tropical cyclone crosses 90°E into the South-West Indian basin from the Australian region basin, it will retain the name assigned to it by the Australian Bureau of Meteorology (BoM). The following storms were named in this manner.[61]

  • Grant

Season effects

This table lists all of the tropical cyclones and subtropical cyclones that were monitored during the 2025–2026 South-West Indian Ocean cyclone season. Information on their intensity, duration, name, areas affected, primarily comes from RSMC La Réunion. Death and damage reports come from either press reports or the relevant national disaster management agency while the damage totals are given in 2025 or 2026 USD.

Name Dates Peak intensity Areas affected Damage
(USD)
Deaths Ref(s).
Category Wind speed Pressure
01 16–18 July Tropical depression 55 km/h (35 mph) 1000 hPa (29.53 inHg) None None None
Awo 6–8 August Moderate tropical storm 75 km/h (45 mph) 1000 hPa (29.53 inHg) Agaléga None None
Blossom 9–12 September Moderate tropical storm 65 km/h (40 mph) 1003 hPa (29.62 inHg) None None None
Chenge 17–25 October Severe tropical storm 95 km/h (60 mph) 985 hPa (29.09 inHg) Chagos Archipelago, Agaléga, Seychelles, Tanzania, Kenya Unknown None
Grant 27 December–6 January Intense tropical cyclone 205 km/h (125 mph) 944 hPa (27.88 inHg) St. Brandon, Tromelin Island, Madagascar (After crossover) Unknown None
Dudzai 10–21 January Intense tropical cyclone 205 km/h (125 mph) 937 hPa (27.67 inHg) Mascarene Islands None None
Ewetse 20–21 January Moderate tropical storm 85 km/h (50 mph) 995 hPa (29.38 inHg) Mozambique, Madagascar Unknown None
08 27–28 January Zone of disturbed weather 35 km/h (25 mph) 1009 hPa (29.80 inHg) Madagascar, Mascarene Islands Unknown None
Fytia 29 January–4 February Tropical cyclone 155 km/h (100 mph) 965 hPa (28.50 inHg) Mozambique, Comoros, Mayotte, Juan de Nova Island, Madagascar, Mascarene Islands Unknown 15 [42]
Gezani 4–18 February Intense tropical cyclone 185 km/h (115 mph) 953 hPa (28.14 inHg) St. Brandon, Mascarene Islands, Madagascar, Juan de Nova Island, Europa Island, Mozambique, Crozet Islands, Kerguelen Islands, Heard Island and McDonald Islands >$142 million 63+
Horacio 18–25 February Intense tropical cyclone 215 km/h (130 mph) 935 hPa (27.61 inHg) Chagos Archipelago, Rodrigues, Saint Paul and Amsterdam Islands None None
12 13 March–Present Tropical depression 55 km/h (35 mph) 1002 hPa (29.59 inHg) Seychelles None None
Season aggregates
12 systems 16 July 2025 – Season ongoing 215 km/h (130 mph) 935 hPa (27.61 inHg) >$142 million 78+

See also

Notes

References

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