Average annual temperature is 27.5 °C
Absolute maximum temperature: 36.8 °C
Absolute minimum temperature: 18.0 °C
Number of sunny days: 97 days
Number of rainy days: 268 days
Look at detailed online map of Nanattan
* Weather data for Nanattan 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) | 30.4 | 33.0 | 35.1 | 36.8 | 33.1 | 33.1 | 33.1 | 33.5 | 32.2 | 32.7 | 31.5 | 29.9 |
| Average daytime temperature (°C) | 28.9 | 30.3 | 32.7 | 33.5 | 31.3 | 31.6 | 31.3 | 32.0 | 30.7 | 30.5 | 29.5 | 28.8 |
| Average temperature (°C) | 24.7 | 25.5 | 27.8 | 28.6 | 28.9 | 29.3 | 28.7 | 28.8 | 28.3 | 27.1 | 25.8 | 25.9 |
| Average night temperature (°C) | 21.1 | 21.4 | 23.8 | 24.6 | 26.7 | 27.7 | 26.9 | 26.6 | 26.2 | 24.5 | 23.3 | 23.7 |
| Absolute minimum temperature (°C) | 18.0 | 18.7 | 21.7 | 22.8 | 23.6 | 26.3 | 26.4 | 25.8 | 25.0 | 22.8 | 22.7 | 22.7 |
| 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 | 11.8 | 12.1 | 12.3 | 12.5 | 12.6 | 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) | 9.5 | 10.2 | 11.0 | 10.8 | 9.3 | 10.7 | 10.0 | 11.2 | 10.5 | 9.7 | 7.4 | 8.4 |
| Precipitation (mm) | 78 | 100 | 44 | 89 | 101 | 17 | 21 | 3 | 60 | 180 | 405 | 218 |
| Sunny days | 14 | 14 | 4 | 1 | 10 | 10 | 18 | 24 | 0 | 0 | 1 | 1 |
| Rainy days | 17 | 14 | 27 | 29 | 21 | 20 | 13 | 7 | 30 | 31 | 29 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Nanattan is at