Average annual temperature is 27.3 °C
Absolute maximum temperature: 39.5 °C
Absolute minimum temperature: 19.0 °C
Number of sunny days: 39 days
Number of rainy days: 326 days
Look at detailed online map of Chadayantalawa
* Weather data for Chadayantalawa 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) | 29.2 | 29.5 | 32.4 | 34.6 | 35.2 | 36.7 | 39.5 | 38.2 | 37.9 | 33.4 | 31.9 | 31.9 |
| Average daytime temperature (°C) | 27.8 | 28.3 | 29.9 | 32.0 | 33.0 | 35.3 | 36.2 | 36.4 | 34.6 | 31.2 | 29.8 | 29.0 |
| Average temperature (°C) | 24.6 | 25.1 | 26.2 | 27.7 | 28.2 | 29.5 | 29.6 | 30.0 | 28.4 | 26.3 | 25.7 | 25.7 |
| Average night temperature (°C) | 21.6 | 22.0 | 23.0 | 23.9 | 24.4 | 25.0 | 24.5 | 24.9 | 24.6 | 23.2 | 23.1 | 23.2 |
| Absolute minimum temperature (°C) | 19.0 | 19.5 | 21.8 | 22.3 | 23.6 | 24.2 | 23.5 | 22.9 | 23.3 | 22.1 | 22.4 | 22.3 |
| 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 | 12.5 | 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) | 8.9 | 9.2 | 9.9 | 10.5 | 9.5 | 10.7 | 9.5 | 11.1 | 9.5 | 9.1 | 7.9 | 7.4 |
| Precipitation (mm) | 180 | 162 | 170 | 102 | 152 | 69 | 51 | 62 | 182 | 360 | 507 | 492 |
| Sunny days | 6 | 5 | 8 | 2 | 4 | 1 | 5 | 5 | 1 | 1 | 0 | 1 |
| Rainy days | 25 | 23 | 23 | 28 | 27 | 29 | 26 | 26 | 29 | 30 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Chadayantalawa is at