Average annual temperature is 26.5 °C
Absolute maximum temperature: 35.7 °C
Absolute minimum temperature: 17.9 °C
Number of sunny days: 56 days
Number of rainy days: 309 days
Look at detailed online map of Galwanguwa
* Weather data for Galwanguwa 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) | 31.8 | 32.5 | 33.1 | 34.2 | 34.8 | 34.4 | 34.2 | 35.7 | 31.1 | 30.8 | 30.4 | 30.6 |
| Average daytime temperature (°C) | 30.1 | 30.5 | 31.1 | 32.3 | 31.7 | 33.3 | 32.1 | 34.3 | 29.7 | 28.9 | 29.1 | 28.8 |
| Average temperature (°C) | 24.9 | 25.3 | 26.1 | 26.9 | 27.6 | 28.8 | 27.9 | 28.8 | 26.1 | 25.2 | 25.2 | 25.3 |
| Average night temperature (°C) | 20.7 | 21.2 | 22.4 | 23.1 | 24.7 | 25.7 | 24.7 | 24.9 | 23.7 | 22.8 | 22.7 | 22.6 |
| Absolute minimum temperature (°C) | 17.9 | 19.0 | 20.5 | 21.8 | 23.5 | 23.8 | 23.3 | 23.7 | 22.2 | 21.9 | 21.7 | 20.9 |
| 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 | 12.4 | 12.3 | 12.2 | 12.0 | 11.8 | 11.8 |
| 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) | 9.6 | 9.5 | 9.7 | 9.8 | 9.2 | 10.8 | 9.8 | 11.0 | 8.6 | 7.0 | 7.3 | 7.6 |
| Precipitation (mm) | 69 | 118 | 136 | 131 | 115 | 20 | 33 | 37 | 177 | 549 | 500 | 343 |
| Sunny days | 11 | 7 | 2 | 1 | 7 | 9 | 9 | 10 | 0 | 0 | 0 | 0 |
| Rainy days | 20 | 21 | 29 | 29 | 24 | 21 | 22 | 21 | 30 | 31 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Galwanguwa is at