Average annual temperature is 26.7 °C
Absolute maximum temperature: 39.8 °C
Absolute minimum temperature: 19.7 °C
Number of sunny days: 44 days
Number of rainy days: 321 days
Look at detailed online map of Siyambalanduwa Division
* Weather data for Siyambalanduwa Division Sri Lanka is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 28.8 | 30.3 | 32.7 | 35.1 | 35.5 | 37.3 | 39.1 | 39.8 | 35.4 | 32.0 | 30.8 | 30.3 |
| Average daytime temperature (°C) | 27.8 | 28.3 | 29.8 | 31.9 | 32.3 | 35.5 | 35.5 | 37.4 | 32.8 | 30.1 | 29.2 | 28.4 |
| Average temperature (°C) | 24.1 | 24.6 | 25.6 | 26.8 | 27.5 | 29.3 | 29.1 | 30.1 | 27.5 | 25.6 | 25.1 | 25.1 |
| Average night temperature (°C) | 21.4 | 21.8 | 22.5 | 23.3 | 24.1 | 25.1 | 24.7 | 25.1 | 24.3 | 23.0 | 22.8 | 22.9 |
| Absolute minimum temperature (°C) | 19.7 | 20.1 | 21.5 | 21.7 | 22.8 | 23.4 | 22.9 | 23.9 | 23.2 | 22.0 | 22.1 | 22.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 |
| Daylight mean duration (h) | 11.8 | 11.9 | 12.1 | 12.3 | 12.4 | 12.5 | 12.5 | 12.3 | 12.2 | 12.0 | 11.8 | 11.7 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 9.2 | 9.3 | 9.5 | 9.9 | 9.4 | 10.5 | 9.7 | 10.9 | 9.4 | 8.2 | 7.4 | 7.4 |
| Precipitation (mm) | 111 | 150 | 121 | 112 | 206 | 51 | 54 | 32 | 112 | 326 | 488 | 354 |
| Sunny days | 9 | 8 | 5 | 3 | 7 | 1 | 3 | 6 | 1 | 0 | 0 | 1 |
| Rainy days | 22 | 20 | 26 | 27 | 24 | 29 | 28 | 25 | 29 | 31 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Siyambalanduwa Division is at