Average annual temperature is 24.5 °C
Absolute maximum temperature: 34.4 °C
Absolute minimum temperature: 18.1 °C
Number of sunny days: 52 days
Number of rainy days: 313 days
Look at detailed online map of Dewarammulla
* Weather data for Dewarammulla 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) | 27.6 | 28.8 | 32.9 | 34.4 | 32.2 | 31.4 | 30.8 | 33.6 | 30.7 | 30.0 | 29.1 | 29.2 |
| Average daytime temperature (°C) | 26.3 | 27.3 | 29.6 | 31.7 | 29.7 | 29.5 | 28.5 | 31.6 | 28.1 | 28.2 | 28.0 | 26.8 |
| Average temperature (°C) | 22.4 | 23.2 | 24.7 | 25.9 | 25.5 | 25.7 | 25.1 | 26.3 | 24.2 | 23.8 | 23.7 | 23.5 |
| Average night temperature (°C) | 19.7 | 20.0 | 21.0 | 21.7 | 22.9 | 23.2 | 22.5 | 22.9 | 21.9 | 21.1 | 21.1 | 21.5 |
| Absolute minimum temperature (°C) | 18.1 | 18.1 | 19.6 | 20.1 | 21.9 | 22.0 | 20.7 | 22.2 | 20.7 | 19.6 | 20.4 | 21.0 |
| 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) | 11.7 | 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) | 9.4 | 9.7 | 10.2 | 10.3 | 9.3 | 10.3 | 9.4 | 10.8 | 8.4 | 8.3 | 7.6 | 7.7 |
| Precipitation (mm) | 63 | 66 | 64 | 140 | 114 | 63 | 92 | 31 | 102 | 249 | 402 | 230 |
| Sunny days | 13 | 13 | 4 | 4 | 2 | 0 | 3 | 10 | 0 | 0 | 1 | 2 |
| Rainy days | 18 | 15 | 27 | 26 | 29 | 30 | 28 | 21 | 30 | 31 | 29 | 29 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Dewarammulla is at