Average annual temperature is 25.6 °C
Absolute maximum temperature: 37.4 °C
Absolute minimum temperature: 15.1 °C
Number of sunny days: 79 days
Number of rainy days: 286 days
Look at detailed online map of Dematawelketiya
* Weather data for Dematawelketiya 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) | 27.0 | 28.2 | 30.8 | 32.6 | 34.1 | 35.4 | 35.7 | 37.4 | 34.8 | 32.1 | 29.5 | 29.0 |
| Average daytime temperature (°C) | 25.7 | 26.7 | 28.1 | 30.4 | 31.5 | 34.2 | 33.2 | 35.8 | 32.4 | 29.3 | 27.7 | 27.0 |
| Average temperature (°C) | 22.3 | 23.1 | 24.2 | 25.6 | 26.6 | 28.8 | 28.0 | 28.5 | 26.6 | 24.9 | 24.1 | 23.8 |
| Average night temperature (°C) | 19.1 | 20.0 | 20.6 | 21.0 | 22.4 | 24.2 | 23.6 | 22.6 | 22.4 | 21.8 | 21.5 | 21.5 |
| Absolute minimum temperature (°C) | 15.1 | 15.9 | 18.9 | 19.0 | 20.5 | 22.7 | 20.8 | 20.8 | 21.0 | 20.0 | 19.6 | 18.6 |
| 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) | 8.3 | 8.7 | 9.0 | 10.3 | 9.4 | 10.7 | 9.5 | 10.8 | 8.6 | 8.1 | 7.7 | 6.4 |
| Precipitation (mm) | 157 | 163 | 122 | 86 | 79 | 9 | 28 | 36 | 70 | 311 | 377 | 428 |
| Sunny days | 3 | 5 | 6 | 7 | 11 | 11 | 16 | 12 | 7 | 1 | 0 | 0 |
| Rainy days | 28 | 23 | 25 | 23 | 20 | 19 | 15 | 19 | 23 | 30 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Dematawelketiya is at