Average annual temperature is 20.6 °C
Absolute maximum temperature: 30.6 °C
Absolute minimum temperature: 10.5 °C
Number of sunny days: 35 days
Number of rainy days: 330 days
Look at detailed online map of Dehiwinna
* Weather data for Dehiwinna 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) | 22.6 | 23.7 | 25.7 | 26.5 | 28.7 | 28.1 | 29.7 | 30.6 | 26.6 | 25.4 | 25.2 | 25.1 |
| Average daytime temperature (°C) | 21.1 | 22.1 | 23.5 | 24.9 | 25.8 | 27.3 | 27.1 | 28.3 | 25.3 | 24.0 | 23.6 | 22.8 |
| Average temperature (°C) | 17.7 | 18.6 | 19.5 | 20.4 | 21.6 | 22.6 | 22.6 | 22.7 | 21.4 | 20.4 | 20.1 | 19.8 |
| Average night temperature (°C) | 14.5 | 14.9 | 15.9 | 16.0 | 17.6 | 18.6 | 18.6 | 17.8 | 18.3 | 17.5 | 16.9 | 17.4 |
| Absolute minimum temperature (°C) | 10.5 | 11.3 | 14.8 | 14.2 | 15.4 | 16.8 | 16.0 | 15.7 | 16.2 | 15.7 | 14.4 | 15.0 |
| 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 | 9.1 | 9.4 | 10.1 | 9.1 | 10.5 | 9.6 | 10.8 | 8.2 | 7.1 | 7.2 | 6.9 |
| Precipitation (mm) | 135 | 147 | 117 | 116 | 146 | 39 | 69 | 97 | 140 | 394 | 504 | 389 |
| Sunny days | 4 | 4 | 3 | 2 | 5 | 3 | 7 | 7 | 0 | 0 | 0 | 0 |
| Rainy days | 27 | 24 | 28 | 28 | 26 | 27 | 24 | 24 | 30 | 31 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Dehiwinna is at