Average annual temperature is 26.5 °C
Absolute maximum temperature: 36.7 °C
Absolute minimum temperature: 18.7 °C
Number of sunny days: 63 days
Number of rainy days: 302 days
Look at detailed online map of Gantiriyagama
* Weather data for Gantiriyagama 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 | 34.5 | 35.9 | 34.3 | 33.8 | 35.0 | 36.7 | 33.6 | 33.2 | 32.1 | 31.1 |
| Average daytime temperature (°C) | 28.5 | 29.5 | 31.9 | 33.8 | 31.9 | 32.3 | 32.0 | 34.7 | 31.4 | 31.1 | 30.2 | 28.9 |
| Average temperature (°C) | 24.0 | 24.9 | 26.6 | 27.6 | 27.4 | 27.8 | 27.6 | 28.6 | 26.7 | 25.9 | 25.3 | 25.3 |
| Average night temperature (°C) | 20.6 | 21.3 | 22.8 | 23.7 | 24.5 | 24.8 | 24.6 | 24.7 | 23.8 | 22.8 | 22.8 | 22.9 |
| Absolute minimum temperature (°C) | 18.7 | 19.6 | 21.7 | 22.7 | 23.2 | 23.4 | 23.2 | 24.0 | 23.0 | 21.7 | 22.1 | 21.7 |
| 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) | 11.7 | 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 | 10.1 | 8.9 | 10.5 | 9.6 | 10.9 | 8.9 | 8.4 | 7.2 | 7.6 |
| Precipitation (mm) | 111 | 108 | 84 | 123 | 111 | 29 | 43 | 37 | 80 | 278 | 481 | 297 |
| Sunny days | 13 | 12 | 6 | 6 | 0 | 5 | 6 | 13 | 1 | 0 | 1 | 0 |
| Rainy days | 18 | 16 | 25 | 24 | 31 | 25 | 25 | 18 | 29 | 31 | 29 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Gantiriyagama is at