Average annual temperature is 26.4 °C
Absolute maximum temperature: 37.4 °C
Absolute minimum temperature: 17.6 °C
Number of sunny days: 75 days
Number of rainy days: 290 days
Look at detailed online map of Rathmalgahawewa
* Weather data for Rathmalgahawewa 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) | 29.0 | 30.8 | 34.3 | 35.3 | 35.0 | 34.4 | 36.6 | 37.4 | 34.8 | 33.4 | 31.3 | 31.3 |
| Average daytime temperature (°C) | 27.7 | 29.2 | 31.7 | 33.5 | 32.3 | 33.3 | 33.7 | 35.2 | 32.8 | 31.7 | 29.5 | 28.6 |
| Average temperature (°C) | 23.4 | 24.3 | 26.0 | 27.2 | 27.5 | 28.5 | 28.5 | 28.6 | 27.4 | 25.7 | 24.7 | 24.8 |
| Average night temperature (°C) | 20.2 | 20.6 | 22.3 | 23.0 | 24.5 | 25.3 | 25.2 | 24.7 | 24.2 | 22.8 | 22.2 | 22.5 |
| Absolute minimum temperature (°C) | 17.6 | 17.8 | 21.1 | 21.4 | 22.7 | 24.1 | 24.4 | 23.6 | 23.2 | 21.7 | 21.7 | 22.0 |
| 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 | 12.6 | 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) | 9.2 | 10.1 | 10.6 | 10.4 | 9.0 | 10.6 | 9.6 | 10.8 | 9.4 | 8.9 | 7.0 | 7.3 |
| Precipitation (mm) | 121 | 87 | 67 | 139 | 137 | 17 | 38 | 85 | 67 | 410 | 495 | 298 |
| Sunny days | 13 | 14 | 6 | 7 | 8 | 6 | 7 | 13 | 1 | 0 | 0 | 0 |
| Rainy days | 18 | 14 | 25 | 23 | 23 | 24 | 24 | 18 | 29 | 31 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Rathmalgahawewa is at