Average annual temperature is 28.2 °C
Absolute maximum temperature: 36.2 °C
Absolute minimum temperature: 23.2 °C
Number of sunny days: 99 days
Number of rainy days: 266 days
Look at detailed online map of Illavalai
* Weather data for Illavalai 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) | 28.0 | 29.6 | 32.9 | 34.5 | 33.7 | 34.9 | 35.6 | 36.2 | 33.5 | 33.4 | 29.9 | 29.8 |
| Average daytime temperature (°C) | 27.2 | 27.7 | 30.3 | 32.5 | 31.5 | 32.5 | 32.6 | 33.5 | 32.0 | 31.5 | 28.8 | 28.1 |
| Average temperature (°C) | 25.7 | 25.9 | 27.8 | 29.4 | 29.5 | 29.9 | 29.6 | 29.8 | 29.2 | 28.4 | 26.4 | 26.4 |
| Average night temperature (°C) | 24.4 | 24.2 | 25.7 | 26.6 | 27.8 | 28.1 | 27.6 | 27.3 | 27.2 | 25.7 | 24.3 | 25.0 |
| Absolute minimum temperature (°C) | 23.7 | 23.2 | 24.3 | 25.3 | 25.2 | 25.6 | 27.0 | 26.8 | 24.8 | 23.5 | 23.5 | 23.8 |
| 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) | 11.6 | 11.8 | 12.1 | 12.3 | 12.6 | 12.7 | 12.6 | 12.4 | 12.2 | 11.9 | 11.7 | 11.6 |
| 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) | 9.7 | 10.1 | 11.1 | 11.0 | 9.3 | 10.0 | 9.2 | 11.3 | 10.5 | 10.5 | 7.8 | 8.1 |
| Precipitation (mm) | 42 | 121 | 35 | 50 | 65 | 45 | 38 | 5 | 38 | 106 | 561 | 284 |
| Sunny days | 14 | 15 | 8 | 8 | 9 | 13 | 9 | 19 | 1 | 2 | 0 | 1 |
| Rainy days | 17 | 13 | 23 | 22 | 22 | 17 | 22 | 12 | 29 | 29 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Illavalai is at