Climate Overview
The climate in Siaya is warm and mild. The average annual temperature is 23°C and approximately 2098mm of precipitation falls per year. Siaya receives a notable amount of rainfall throughout the year, including during its driest month. Siaya sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Siaya has relatively stable temperatures year-round, staying within a 10°C range. The warmest month is February, when average highs reach 29°C and the mean temperature sits around 24°C. July is the coolest month, with minimum temperatures around 19°C and an average of 22°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows.
Precipitation
Siaya is a very wet location, receiving approximately 2098mm of precipitation annually, which averages out to around 175mm per month. The wettest month is April, averaging 314mm of rainfall. November and May also tend to see above-average precipitation. The driest month is February, with just 93mm. That's 221mm less than April, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.
Wind
Siaya is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in Siaya, which began on September 23, 2026. Siaya sits near the equator, so the traditional four-season cycle is less pronounced. Temperatures remain relatively stable year-round. The warmest period peaks in February at around 29°C, while the coldest stretch bottoms out in July near 19°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 20 to 28°C. Rainfall is heavy, totalling around 749mm across the season with a monthly average of 250mm. Winds are generally light, averaging 6km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 19 to 27°C. Rainfall is heavy, totalling around 355mm across the season with a monthly average of 118mm. Winds are generally light, averaging 6km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 20 to 27°C. Rainfall is heavy, totalling around 595mm across the season with a monthly average of 198mm. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 20 to 29°C. Rainfall is heavy, totalling around 399mm across the season with a monthly average of 133mm. Winds are generally light, averaging 7km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Siaya is during February, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 93mm per month. By contrast, July can be quite cold with temperatures dropping to 19°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.
Monthly Climate Data
The table below shows monthly climate averages for Siaya based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
