Average annual temperature is 26.4 °C
Absolute maximum temperature: 36.2 °C
Absolute minimum temperature: 18.5 °C
Number of sunny days: 36 days
Number of rainy days: 329 days
Look at detailed online map of Rathnagiriya
* Weather data for Rathnagiriya 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) | 31.3 | 33.7 | 34.1 | 36.2 | 32.2 | 31.2 | 30.6 | 31.9 | 30.6 | 31.9 | 31.9 | 31.6 |
| Average daytime temperature (°C) | 29.9 | 31.3 | 32.5 | 32.5 | 30.5 | 29.9 | 29.4 | 30.7 | 29.0 | 29.6 | 30.3 | 30.2 |
| Average temperature (°C) | 24.8 | 25.8 | 27.0 | 27.2 | 27.3 | 27.3 | 27.0 | 27.4 | 26.0 | 25.6 | 25.5 | 25.9 |
| Average night temperature (°C) | 20.9 | 21.6 | 23.2 | 23.6 | 24.7 | 24.9 | 25.1 | 24.9 | 23.8 | 22.9 | 22.8 | 23.1 |
| Absolute minimum temperature (°C) | 18.5 | 19.7 | 22.3 | 22.3 | 22.7 | 23.4 | 23.9 | 23.3 | 22.8 | 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 | 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) | 9.4 | 9.7 | 10.8 | 10.3 | 9.4 | 10.4 | 9.9 | 11.0 | 8.4 | 8.5 | 7.8 | 7.8 |
| Precipitation (mm) | 88 | 90 | 112 | 178 | 229 | 164 | 127 | 61 | 376 | 368 | 578 | 304 |
| Sunny days | 17 | 14 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 |
| Rainy days | 14 | 14 | 30 | 29 | 31 | 30 | 31 | 30 | 30 | 30 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Rathnagiriya is at