Average annual temperature is 23.6 °C
Absolute maximum temperature: 33.4 °C
Absolute minimum temperature: 15.5 °C
Number of sunny days: 60 days
Number of rainy days: 305 days
Look at detailed online map of Udadeltota
* Weather data for Udadeltota 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) | 27.0 | 28.1 | 32.3 | 33.4 | 30.3 | 29.9 | 29.7 | 31.7 | 29.1 | 28.6 | 27.7 | 28.0 |
| Average daytime temperature (°C) | 25.3 | 26.4 | 28.9 | 30.6 | 28.2 | 28.4 | 27.4 | 30.3 | 27.4 | 26.8 | 26.7 | 26.3 |
| Average temperature (°C) | 21.5 | 22.4 | 23.9 | 24.8 | 24.1 | 24.7 | 23.9 | 24.9 | 23.4 | 23.1 | 22.9 | 23.1 |
| Average night temperature (°C) | 18.1 | 18.7 | 19.9 | 20.2 | 20.6 | 21.9 | 21.2 | 20.6 | 20.3 | 20.0 | 20.2 | 20.8 |
| Absolute minimum temperature (°C) | 15.5 | 16.2 | 18.9 | 18.8 | 18.8 | 20.2 | 18.9 | 18.7 | 18.1 | 18.7 | 18.5 | 19.4 |
| 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) | 9.4 | 9.8 | 10.1 | 10.1 | 9.3 | 10.2 | 9.2 | 10.8 | 8.5 | 7.6 | 7.3 | 7.9 |
| Precipitation (mm) | 52 | 49 | 57 | 109 | 85 | 54 | 92 | 33 | 98 | 330 | 412 | 243 |
| Sunny days | 16 | 13 | 6 | 4 | 1 | 0 | 4 | 8 | 2 | 2 | 1 | 3 |
| Rainy days | 15 | 15 | 25 | 26 | 30 | 30 | 27 | 23 | 28 | 29 | 29 | 28 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Udadeltota is at