Average annual temperature is 26.0 °C
Absolute maximum temperature: 36.2 °C
Absolute minimum temperature: 18.5 °C
Number of sunny days: 43 days
Number of rainy days: 322 days
Look at detailed online map of Heratgama
* Weather data for Heratgama 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) | 30.1 | 31.5 | 35.1 | 36.2 | 33.6 | 32.8 | 32.1 | 34.7 | 31.5 | 32.1 | 31.2 | 30.7 |
| Average daytime temperature (°C) | 28.4 | 29.6 | 32.1 | 33.5 | 31.2 | 30.7 | 29.8 | 32.8 | 29.5 | 29.9 | 29.8 | 28.9 |
| Average temperature (°C) | 24.2 | 25.0 | 26.6 | 27.3 | 26.9 | 27.0 | 26.4 | 27.7 | 25.6 | 25.2 | 25.2 | 25.2 |
| Average night temperature (°C) | 21.1 | 21.2 | 22.6 | 23.1 | 24.3 | 24.6 | 23.9 | 24.4 | 23.2 | 22.3 | 22.4 | 23.0 |
| Absolute minimum temperature (°C) | 19.4 | 18.5 | 21.6 | 21.8 | 22.9 | 23.4 | 22.0 | 23.4 | 22.1 | 20.9 | 21.5 | 22.1 |
| 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) | 9.5 | 9.9 | 10.4 | 10.2 | 9.1 | 10.2 | 9.2 | 10.8 | 8.3 | 8.2 | 7.5 | 7.8 |
| Precipitation (mm) | 55 | 57 | 70 | 144 | 135 | 83 | 143 | 39 | 146 | 342 | 455 | 251 |
| Sunny days | 15 | 12 | 5 | 2 | 0 | 0 | 1 | 5 | 0 | 0 | 1 | 2 |
| Rainy days | 16 | 16 | 26 | 28 | 31 | 30 | 30 | 26 | 30 | 31 | 29 | 29 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Heratgama is at