Average annual temperature is 24.5 °C
Absolute maximum temperature: 32.8 °C
Absolute minimum temperature: 15.1 °C
Number of sunny days: 26 days
Number of rainy days: 339 days
Look at detailed online map of Ilwana
* Weather data for Ilwana 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) | 29.1 | 30.9 | 31.5 | 32.8 | 30.0 | 29.0 | 28.4 | 29.5 | 28.6 | 29.4 | 30.2 | 29.9 |
| Average daytime temperature (°C) | 27.9 | 28.7 | 29.9 | 30.5 | 28.2 | 27.4 | 27.0 | 28.3 | 26.8 | 27.5 | 28.1 | 28.4 |
| Average temperature (°C) | 23.2 | 24.0 | 25.0 | 25.4 | 25.3 | 24.8 | 24.6 | 25.1 | 24.0 | 24.1 | 24.1 | 24.6 |
| Average night temperature (°C) | 18.7 | 19.5 | 20.8 | 21.5 | 23.4 | 23.2 | 22.7 | 22.7 | 22.4 | 21.8 | 21.3 | 21.5 |
| Absolute minimum temperature (°C) | 15.1 | 17.2 | 19.1 | 19.1 | 22.2 | 22.0 | 21.6 | 22.0 | 21.5 | 20.5 | 18.9 | 19.6 |
| 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 | 12.5 | 12.3 | 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 | 9.7 | 10.0 | 9.7 | 8.9 | 8.8 | 8.6 | 10.6 | 7.0 | 7.2 | 6.9 | 7.8 |
| Precipitation (mm) | 119 | 115 | 123 | 227 | 168 | 171 | 221 | 84 | 303 | 526 | 788 | 349 |
| Sunny days | 11 | 5 | 2 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 5 |
| Rainy days | 20 | 23 | 29 | 29 | 31 | 30 | 31 | 30 | 30 | 30 | 30 | 26 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Ilwana is at