Average annual temperature is 26.8 °C
Absolute maximum temperature: 37.9 °C
Absolute minimum temperature: 18.9 °C
Number of sunny days: 75 days
Number of rainy days: 290 days
Look at detailed online map of Gammahegewewa
* Weather data for Gammahegewewa 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 | 31.0 | 34.7 | 36.4 | 35.5 | 35.1 | 37.5 | 37.9 | 35.0 | 33.8 | 31.4 | 31.3 |
| Average daytime temperature (°C) | 27.9 | 29.3 | 31.8 | 33.9 | 32.8 | 34.0 | 34.3 | 35.8 | 33.2 | 31.9 | 29.6 | 28.8 |
| Average temperature (°C) | 23.9 | 24.7 | 26.4 | 27.7 | 27.8 | 29.0 | 28.9 | 29.1 | 27.7 | 26.1 | 25.1 | 25.1 |
| Average night temperature (°C) | 20.9 | 21.3 | 22.8 | 23.7 | 24.8 | 25.6 | 25.5 | 25.0 | 24.5 | 23.1 | 22.6 | 22.9 |
| Absolute minimum temperature (°C) | 18.9 | 19.1 | 21.8 | 22.4 | 22.8 | 24.5 | 24.6 | 23.6 | 23.6 | 22.4 | 21.9 | 22.4 |
| 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 | 12.6 | 12.4 | 12.2 | 11.9 | 11.7 | 11.6 |
| 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) | 9.3 | 10.0 | 10.6 | 10.4 | 9.0 | 10.7 | 9.6 | 10.9 | 9.6 | 9.0 | 7.1 | 7.3 |
| Precipitation (mm) | 142 | 80 | 66 | 124 | 134 | 14 | 38 | 74 | 78 | 429 | 483 | 290 |
| Sunny days | 13 | 13 | 5 | 8 | 8 | 6 | 8 | 13 | 1 | 0 | 0 | 0 |
| Rainy days | 18 | 15 | 26 | 22 | 23 | 24 | 23 | 18 | 29 | 31 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Gammahegewewa is at