Average annual temperature is 26.0 °C
Absolute maximum temperature: 33.5 °C
Absolute minimum temperature: 19.1 °C
Number of sunny days: 20 days
Number of rainy days: 345 days
Look at detailed online map of Biyagama West
* Weather data for Biyagama West 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) | 31.6 | 33.5 | 32.5 | 33.0 | 31.3 | 30.3 | 30.2 | 30.7 | 30.6 | 31.2 | 31.2 | 32.5 |
| Average daytime temperature (°C) | 30.1 | 30.6 | 31.0 | 31.6 | 30.1 | 29.5 | 29.3 | 29.7 | 28.8 | 29.3 | 29.9 | 30.2 |
| Average temperature (°C) | 25.0 | 25.5 | 26.2 | 26.8 | 26.8 | 26.4 | 26.5 | 26.7 | 25.5 | 25.4 | 25.3 | 25.7 |
| Average night temperature (°C) | 21.1 | 21.5 | 22.6 | 23.2 | 24.4 | 23.9 | 24.1 | 24.2 | 23.4 | 22.9 | 22.6 | 22.9 |
| Absolute minimum temperature (°C) | 19.1 | 19.6 | 21.4 | 22.1 | 22.6 | 22.8 | 22.5 | 23.2 | 22.7 | 21.9 | 21.9 | 22.2 |
| 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) | 9.4 | 9.8 | 10.3 | 10.3 | 8.5 | 8.8 | 9.6 | 10.8 | 6.8 | 7.1 | 7.3 | 7.7 |
| Precipitation (mm) | 120 | 112 | 185 | 218 | 271 | 422 | 291 | 164 | 572 | 652 | 541 | 449 |
| Sunny days | 12 | 5 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 |
| Rainy days | 19 | 23 | 31 | 28 | 31 | 30 | 31 | 31 | 30 | 30 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Biyagama West is at