Average annual temperature is 22.2 °C
Absolute maximum temperature: 34.3 °C
Absolute minimum temperature: 15.4 °C
Number of sunny days: 58 days
Number of rainy days: 307 days
Look at detailed online map of Siaya
* Weather data for Siaya Kenya is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 33.6 | 34.2 | 32.1 | 29.9 | 29.1 | 29.7 | 31.2 | 32.9 | 30.7 | 34.3 | 29.2 | 32.4 |
| Average daytime temperature (°C) | 30.3 | 31.6 | 27.0 | 26.9 | 27.6 | 27.5 | 28.7 | 29.9 | 28.3 | 29.5 | 26.9 | 27.9 |
| Average temperature (°C) | 22.5 | 23.9 | 21.3 | 21.5 | 21.8 | 21.8 | 22.2 | 23.1 | 21.9 | 22.7 | 21.3 | 22.1 |
| Average night temperature (°C) | 17.1 | 18.6 | 17.5 | 18.1 | 17.4 | 17.5 | 17.3 | 17.7 | 17.6 | 18.2 | 17.7 | 18.1 |
| Absolute minimum temperature (°C) | 15.4 | 16.4 | 16.4 | 16.7 | 16.3 | 16.4 | 15.8 | 16.2 | 16.1 | 17.0 | 16.7 | 16.8 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 |
| Daylight mean duration (h) | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 |
| Daylight minimum duration (h) | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 |
| Sunshine mean duration (h) | 11.0 | 11.2 | 9.7 | 9.2 | 10.6 | 10.5 | 10.7 | 10.8 | 10.5 | 10.2 | 9.6 | 10.3 |
| Precipitation (mm) | 25 | 29 | 249 | 266 | 86 | 74 | 45 | 36 | 104 | 183 | 168 | 102 |
| Sunny days | 13 | 16 | 5 | 4 | 3 | 1 | 8 | 5 | 1 | 1 | 0 | 1 |
| Rainy days | 18 | 12 | 26 | 26 | 28 | 29 | 23 | 26 | 29 | 30 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Siaya is at