Average annual temperature is 26.4 °C
Absolute maximum temperature: 35.5 °C
Absolute minimum temperature: 18.6 °C
Number of sunny days: 43 days
Number of rainy days: 322 days
Look at detailed online map of Sundaragama
* Weather data for Sundaragama 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) | 30.8 | 32.5 | 34.8 | 35.5 | 33.8 | 33.0 | 32.5 | 34.9 | 32.2 | 33.0 | 32.2 | 31.3 |
| Average daytime temperature (°C) | 29.4 | 30.5 | 32.7 | 33.6 | 31.5 | 31.0 | 30.5 | 33.1 | 29.9 | 30.3 | 30.5 | 29.8 |
| Average temperature (°C) | 24.5 | 25.5 | 27.0 | 27.5 | 27.3 | 27.2 | 27.0 | 28.0 | 26.0 | 25.7 | 25.6 | 25.8 |
| Average night temperature (°C) | 20.8 | 21.6 | 23.1 | 23.7 | 24.7 | 24.5 | 24.4 | 24.7 | 23.6 | 23.1 | 23.0 | 23.2 |
| Absolute minimum temperature (°C) | 18.6 | 19.6 | 22.1 | 22.4 | 23.1 | 22.6 | 23.0 | 23.7 | 22.7 | 21.8 | 22.6 | 22.5 |
| 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 | 10.6 | 10.1 | 9.2 | 10.1 | 9.6 | 11.0 | 8.1 | 8.1 | 7.4 | 7.9 |
| Precipitation (mm) | 52 | 68 | 118 | 198 | 155 | 94 | 103 | 20 | 198 | 339 | 555 | 253 |
| Sunny days | 15 | 12 | 2 | 3 | 1 | 0 | 1 | 7 | 1 | 0 | 0 | 1 |
| Rainy days | 16 | 16 | 29 | 27 | 30 | 30 | 30 | 24 | 29 | 31 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Sundaragama is at