Climate Insights for Siaya

The climate in Siaya is warm and mild. The average annual temperature is 23°C and approximately 2067mm 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.

Siaya has relatively stable temperatures year-round, staying within a 9°C range. The warmest month is February, when average highs reach 28°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.

Siaya is a very wet location, receiving approximately 2067mm of precipitation annually, which averages out to around 172mm per month. The wettest month is April, averaging 309mm of rainfall. November and May also tend to see above-average precipitation. The driest month is February, with just 94mm. That's 215mm 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.

Siaya is mildly breezy, with an average annual wind speed of 12km/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 15km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 14km/h in winter, 13km/h in spring, 11km/h in summer, 11km/h in autumn.

It is currently spring in Siaya, which began on March 20, 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 28°C, while the coldest stretch bottoms out in July near 19°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Siaya is during February and July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 95mm per month. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

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.