Average annual temperature is 23.1 °C
Absolute maximum temperature: 33.0 °C
Absolute minimum temperature: 16.0 °C
Number of sunny days: 35 days
Number of rainy days: 330 days
Look at detailed online map of Heyagolla
* Weather data for Heyagolla 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) | 25.5 | 26.5 | 29.1 | 30.7 | 30.4 | 31.0 | 31.4 | 33.0 | 29.0 | 27.2 | 26.5 | 26.4 |
| Average daytime temperature (°C) | 24.5 | 25.1 | 26.3 | 27.9 | 28.2 | 29.5 | 28.6 | 30.8 | 27.3 | 25.8 | 25.5 | 24.9 |
| Average temperature (°C) | 21.1 | 21.7 | 22.6 | 23.6 | 24.2 | 24.9 | 24.2 | 24.9 | 23.2 | 22.4 | 22.2 | 22.2 |
| Average night temperature (°C) | 18.5 | 18.9 | 19.8 | 20.2 | 21.0 | 20.9 | 20.3 | 20.1 | 20.2 | 19.9 | 19.9 | 20.2 |
| Absolute minimum temperature (°C) | 16.0 | 16.1 | 18.8 | 19.2 | 19.8 | 20.0 | 19.1 | 19.3 | 19.2 | 18.8 | 18.7 | 18.7 |
| 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) | 9.2 | 9.3 | 9.7 | 10.3 | 9.2 | 10.6 | 9.9 | 11.0 | 9.2 | 8.2 | 7.4 | 7.6 |
| Precipitation (mm) | 66 | 108 | 111 | 126 | 188 | 130 | 133 | 140 | 357 | 673 | 544 | 292 |
| Sunny days | 14 | 8 | 1 | 1 | 3 | 0 | 2 | 4 | 0 | 0 | 0 | 2 |
| Rainy days | 17 | 20 | 30 | 29 | 28 | 30 | 29 | 27 | 30 | 31 | 30 | 29 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Heyagolla is at