Our seasonal forecasts
Our seasonal forecasts help Eastern Africa prepare for the season and mitigate the effects of climate extremes.
August - October 2025
Rainfall
Temperature
- Warmer than average conditions are expected over northern and southern Sudan, eastern and western South Sudan, central to southern Ethiopia, Somalia, southern and north-eastern Kenya, Uganda, Rwanda, Burundi and Tanzania.
- Normal to cooler than normal temperature conditions likely to be recorded over north-western Somalia, northern Ethiopia, southern Djibouti, western Eritrea, parts of western, central and eastern Sudan north-western Kenya, north-eastern Uganda and south-eastern South Sudan.
- Wetter than usual conditions expected over most parts of the northern sector of the region, western Kenya, Uganda and Rwanda.
- Drier than usual conditions expected over part of north-western South Sudan, south-eastern Ethiopia, central to southern Somalia, and eastern Kenya.
Seasonal forecasts
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Probability of 400 mm
- High chances of exceeding 400 mm rainfall over the Lake Victoria Basin and south-western Ethiopia.
- Low chances of exceeding 40 mm rainfall over the rest of the region.
Onset dates
- Onset expected from second week of March over western and south-western Kenya and progress northwards.
Probability of 300 mm
- High chances of exceeding 300 mm rainfallover central to western Kenya, Tanzania, Rwanda, Burundi, Uganda, south western South Sudan, and south-western Ethiopia.
Temperature forecast
- Warmer than average temperatures are expected all over the region with highest probabilities indicated over Sudan, Ethiopia, Kenya, and southern areas of Tanzania.
Temperature forecast
- Warmer than normal temperatures expected over eastern parts of the region and northern areas of Sudan.
- Near normal temperatures expected in the western and south-western parts of Tanzania, Burundi, eastern Rwanda, central Ethiopia, and part …
Onset anomalies
- Early onset expected in eastern South Sudan and parts of Ethiopia.
Probability of 300 mm
- Higher chances of rainfall exceeding 300 mm over central to western Ethiopia, South Sudan, Uganda, and southern Sudan.
Rainfall forecast
- Wetter than normal conditions expected over most parts of northern Greater Horn of Africa (GHA).
- Drier than normal conditions expected over coastal Kenya, southern coast of Somalia, and localized areas in south-eastern Ethiopia.
Length of wet spells
- Longest wet spells expected over western to central Ethiopia.
Onset dates
- Bi-Modal (areas that experience two seasons within the year) areas of Tanzania, Rwanda, and Burundi are expected to record onset from the second dekad of February.
- Uganda and Kenya are expected to record onset …
Probability of 300 mm
- The highest chances of rainfall exceeding 300 mm are expected over southern and north-western Tanzania, Burundi, Uganda, western Kenya, and south-western Ethiopia.
Onset anomalies
- Early-onset is expected over central to north-eastern Somalia and Djibouti.
- Late-onset is expected over isolated areas in western Kenya, Uganda, and north-eastern Ethiopia.
- The rest of the region is expected to record normal onset.
Length of dry spells
- The longest first dry spell after the onset is expected over Tanzania, eastern Kenya, and northern Somalia.
- The rest of the region is expected to record the first dry spell of between 2 and 8 …
Temperature forecast
- Warmer than usual conditions are expected over north-western, north-eastern, and southern parts of the country.
- Usual conditions are expected over the northern and central parts of the country.