Average annual temperature is 26.4 °C
Absolute maximum temperature: 36.3 °C
Absolute minimum temperature: 18.0 °C
Number of sunny days: 62 days
Number of rainy days: 303 days
Look at detailed online map of Shasthrawelliya
* Weather data for Shasthrawelliya 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 | 30.9 | 34.0 | 35.2 | 33.9 | 33.6 | 34.5 | 36.3 | 33.9 | 32.5 | 31.9 | 31.2 |
| Average daytime temperature (°C) | 28.0 | 29.1 | 31.3 | 33.3 | 31.5 | 32.2 | 32.0 | 34.5 | 31.5 | 30.8 | 29.9 | 28.7 |
| Average temperature (°C) | 23.8 | 24.7 | 26.4 | 27.5 | 27.3 | 27.8 | 27.5 | 28.5 | 26.7 | 25.8 | 25.3 | 25.1 |
| Average night temperature (°C) | 20.5 | 21.2 | 22.9 | 23.7 | 24.5 | 24.7 | 24.5 | 24.6 | 23.7 | 22.9 | 22.7 | 22.9 |
| Absolute minimum temperature (°C) | 18.0 | 19.3 | 21.6 | 22.3 | 23.3 | 23.4 | 23.2 | 23.8 | 22.9 | 21.9 | 22.0 | 22.0 |
| 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 | 11.9 | 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 | 9.8 | 10.5 | 10.2 | 9.0 | 10.7 | 9.7 | 10.9 | 9.1 | 8.4 | 7.1 | 7.6 |
| Precipitation (mm) | 114 | 99 | 82 | 124 | 133 | 26 | 40 | 52 | 81 | 278 | 502 | 286 |
| Sunny days | 14 | 11 | 6 | 5 | 1 | 4 | 5 | 14 | 1 | 0 | 1 | 0 |
| Rainy days | 17 | 17 | 25 | 25 | 30 | 26 | 26 | 17 | 29 | 31 | 29 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Shasthrawelliya is at