Average annual temperature is 26.3 °C
Absolute maximum temperature: 36.3 °C
Absolute minimum temperature: 18.3 °C
Number of sunny days: 43 days
Number of rainy days: 322 days
Look at detailed online map of Siwallawa
* Weather data for Siwallawa 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) | 30.8 | 32.5 | 35.2 | 36.3 | 33.6 | 32.2 | 32.4 | 35.0 | 32.1 | 32.5 | 32.3 | 31.4 |
| Average daytime temperature (°C) | 29.2 | 30.5 | 32.8 | 33.8 | 31.2 | 30.8 | 30.2 | 33.1 | 29.4 | 30.0 | 30.2 | 29.6 |
| Average temperature (°C) | 24.5 | 25.5 | 27.0 | 27.4 | 27.1 | 27.0 | 26.7 | 27.9 | 25.7 | 25.4 | 25.3 | 25.6 |
| Average night temperature (°C) | 20.9 | 21.3 | 23.0 | 23.3 | 24.5 | 24.3 | 24.0 | 24.5 | 23.3 | 22.7 | 22.6 | 23.2 |
| Absolute minimum temperature (°C) | 19.0 | 18.3 | 22.0 | 21.9 | 23.1 | 22.8 | 22.4 | 23.3 | 22.3 | 21.7 | 21.6 | 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) | 11.7 | 11.9 | 12.1 | 12.3 | 12.5 | 12.6 | 12.5 | 12.4 | 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) | 9.6 | 9.8 | 10.3 | 9.8 | 8.7 | 9.7 | 9.1 | 10.8 | 7.8 | 7.7 | 7.1 | 7.7 |
| Precipitation (mm) | 76 | 81 | 134 | 179 | 153 | 91 | 125 | 31 | 203 | 377 | 583 | 268 |
| Sunny days | 15 | 13 | 2 | 3 | 0 | 0 | 1 | 5 | 0 | 0 | 0 | 4 |
| Rainy days | 16 | 15 | 29 | 27 | 31 | 30 | 30 | 26 | 30 | 31 | 30 | 27 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Siwallawa is at