Average annual temperature is 23.0 °C
Absolute maximum temperature: 31.9 °C
Absolute minimum temperature: 15.5 °C
Number of sunny days: 46 days
Number of rainy days: 319 days
Look at detailed online map of Koonwalla
* Weather data for Koonwalla 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) | 25.7 | 26.8 | 29.2 | 31.1 | 30.9 | 29.9 | 30.0 | 31.9 | 29.6 | 29.0 | 27.4 | 27.5 |
| Average daytime temperature (°C) | 24.1 | 25.1 | 26.5 | 28.6 | 28.0 | 28.6 | 27.2 | 30.4 | 27.1 | 26.5 | 26.2 | 25.3 |
| Average temperature (°C) | 20.6 | 21.5 | 22.6 | 24.0 | 24.0 | 24.6 | 23.7 | 24.7 | 23.2 | 22.7 | 22.6 | 22.2 |
| Average night temperature (°C) | 17.9 | 18.6 | 19.7 | 20.5 | 21.4 | 22.2 | 21.3 | 21.0 | 20.8 | 20.1 | 20.3 | 20.4 |
| Absolute minimum temperature (°C) | 15.5 | 15.7 | 18.8 | 18.8 | 19.9 | 21.1 | 20.3 | 20.1 | 19.8 | 18.7 | 19.7 | 19.3 |
| 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 | 12.5 | 12.5 | 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) | 8.8 | 9.1 | 9.5 | 10.2 | 9.2 | 10.4 | 8.9 | 10.8 | 8.5 | 7.5 | 7.3 | 6.8 |
| Precipitation (mm) | 90 | 102 | 128 | 103 | 114 | 31 | 81 | 61 | 129 | 430 | 548 | 309 |
| Sunny days | 5 | 4 | 3 | 6 | 6 | 4 | 5 | 11 | 1 | 1 | 0 | 0 |
| Rainy days | 26 | 24 | 28 | 24 | 25 | 26 | 26 | 20 | 29 | 30 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Koonwalla is at