Average annual temperature is 23.9 °C
Absolute maximum temperature: 35.4 °C
Absolute minimum temperature: 13.6 °C
Number of sunny days: 31 days
Number of rainy days: 334 days
Look at detailed online map of Rathanawatta
* Weather data for Rathanawatta 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) | 25.3 | 26.1 | 29.4 | 30.5 | 31.9 | 33.2 | 35.1 | 35.4 | 31.3 | 29.3 | 28.7 | 27.7 |
| Average daytime temperature (°C) | 24.0 | 25.1 | 26.9 | 28.7 | 29.7 | 31.6 | 31.7 | 33.9 | 29.5 | 27.5 | 26.8 | 25.8 |
| Average temperature (°C) | 20.8 | 21.6 | 22.7 | 23.7 | 24.7 | 26.2 | 26.2 | 27.0 | 24.9 | 23.5 | 23.0 | 22.8 |
| Average night temperature (°C) | 17.7 | 18.2 | 18.8 | 18.9 | 20.1 | 21.2 | 21.4 | 21.4 | 21.3 | 20.3 | 20.1 | 20.3 |
| Absolute minimum temperature (°C) | 13.6 | 14.3 | 17.6 | 17.2 | 17.7 | 19.7 | 19.7 | 19.5 | 19.6 | 18.9 | 17.2 | 17.7 |
| 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) | 11.8 | 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) | 7.9 | 8.3 | 8.5 | 9.9 | 9.2 | 10.5 | 9.7 | 10.6 | 8.3 | 7.3 | 7.0 | 6.1 |
| Precipitation (mm) | 263 | 208 | 174 | 168 | 127 | 126 | 47 | 77 | 171 | 334 | 578 | 531 |
| Sunny days | 0 | 4 | 4 | 0 | 7 | 3 | 5 | 8 | 0 | 0 | 0 | 0 |
| Rainy days | 31 | 24 | 27 | 30 | 24 | 27 | 26 | 23 | 30 | 31 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Rathanawatta is at