Average annual temperature is 26.7 °C
Absolute maximum temperature: 36.3 °C
Absolute minimum temperature: 18.4 °C
Number of sunny days: 57 days
Number of rainy days: 308 days
Look at detailed online map of Idallewa
* Weather data for Idallewa 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) | 30.6 | 32.7 | 34.2 | 36.3 | 32.7 | 31.8 | 33.0 | 34.7 | 31.3 | 32.7 | 32.1 | 31.4 |
| Average daytime temperature (°C) | 29.1 | 30.5 | 32.3 | 33.1 | 30.9 | 30.7 | 30.6 | 32.7 | 29.9 | 30.2 | 30.3 | 30.0 |
| Average temperature (°C) | 24.4 | 25.4 | 27.0 | 27.5 | 27.7 | 28.0 | 27.7 | 28.3 | 26.7 | 25.9 | 25.6 | 25.8 |
| Average night temperature (°C) | 20.7 | 21.3 | 23.0 | 23.7 | 24.9 | 25.6 | 25.6 | 25.3 | 24.1 | 23.1 | 22.9 | 23.2 |
| Absolute minimum temperature (°C) | 18.4 | 19.0 | 21.8 | 22.2 | 22.5 | 23.8 | 24.1 | 23.7 | 23.3 | 21.8 | 22.1 | 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 | 11.9 | 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) | 9.2 | 9.9 | 10.8 | 10.4 | 9.3 | 10.7 | 9.7 | 11.1 | 9.1 | 8.7 | 7.6 | 8.2 |
| Precipitation (mm) | 69 | 105 | 107 | 137 | 167 | 81 | 54 | 21 | 240 | 314 | 481 | 270 |
| Sunny days | 16 | 15 | 4 | 0 | 0 | 1 | 5 | 14 | 1 | 0 | 0 | 1 |
| Rainy days | 15 | 13 | 27 | 30 | 31 | 29 | 26 | 17 | 29 | 31 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Idallewa is at