Average annual temperature is 26.2 °C
Absolute maximum temperature: 36.5 °C
Absolute minimum temperature: 19.2 °C
Number of sunny days: 42 days
Number of rainy days: 323 days
Look at detailed online map of Rathneheruwa
* Weather data for Rathneheruwa 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) | 31.0 | 32.8 | 35.1 | 36.5 | 33.4 | 31.8 | 31.3 | 33.4 | 31.4 | 32.2 | 31.7 | 31.5 |
| Average daytime temperature (°C) | 29.7 | 30.9 | 33.2 | 33.5 | 30.9 | 30.3 | 29.7 | 31.8 | 28.9 | 29.6 | 30.1 | 29.8 |
| Average temperature (°C) | 24.8 | 25.7 | 27.1 | 27.4 | 27.1 | 26.7 | 26.5 | 27.4 | 25.5 | 25.4 | 25.4 | 25.8 |
| Average night temperature (°C) | 21.2 | 21.6 | 23.3 | 23.7 | 24.6 | 24.2 | 23.9 | 24.3 | 23.3 | 23.0 | 22.8 | 23.2 |
| Absolute minimum temperature (°C) | 19.2 | 19.5 | 22.4 | 22.7 | 23.2 | 22.2 | 22.6 | 23.3 | 22.3 | 22.1 | 22.2 | 22.3 |
| 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 | 12.5 | 12.5 | 12.4 | 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 | 10.3 | 9.9 | 9.1 | 9.8 | 9.3 | 10.8 | 7.7 | 7.7 | 7.4 | 7.9 |
| Precipitation (mm) | 73 | 93 | 139 | 185 | 186 | 151 | 158 | 42 | 331 | 421 | 616 | 277 |
| Sunny days | 16 | 15 | 1 | 0 | 0 | 0 | 1 | 3 | 1 | 1 | 0 | 4 |
| Rainy days | 15 | 13 | 30 | 30 | 31 | 30 | 30 | 28 | 29 | 30 | 30 | 27 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Rathneheruwa is at