Average annual temperature is 25.9 °C
Absolute maximum temperature: 35.6 °C
Absolute minimum temperature: 19.2 °C
Number of sunny days: 35 days
Number of rainy days: 330 days
Look at detailed online map of Diddeniya
* Weather data for Diddeniya 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) | 29.8 | 31.1 | 34.1 | 35.6 | 33.6 | 32.5 | 32.1 | 35.0 | 31.7 | 32.3 | 31.0 | 30.8 |
| Average daytime temperature (°C) | 28.3 | 29.3 | 31.6 | 33.2 | 31.2 | 30.7 | 29.9 | 32.9 | 29.6 | 29.9 | 29.7 | 28.8 |
| Average temperature (°C) | 24.0 | 24.8 | 26.3 | 27.1 | 26.9 | 27.0 | 26.4 | 27.7 | 25.6 | 25.2 | 25.1 | 25.1 |
| Average night temperature (°C) | 21.0 | 21.4 | 22.5 | 23.2 | 24.3 | 24.5 | 23.9 | 24.3 | 23.2 | 22.4 | 22.5 | 22.9 |
| Absolute minimum temperature (°C) | 19.2 | 19.9 | 21.4 | 21.8 | 23.0 | 23.3 | 22.3 | 23.4 | 22.2 | 20.7 | 21.7 | 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 | 12.6 | 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) | 9.5 | 9.7 | 10.4 | 10.2 | 9.1 | 10.2 | 9.2 | 10.8 | 8.2 | 8.2 | 7.4 | 7.5 |
| Precipitation (mm) | 63 | 73 | 71 | 169 | 148 | 75 | 115 | 39 | 146 | 359 | 464 | 258 |
| Sunny days | 13 | 9 | 4 | 2 | 0 | 0 | 0 | 5 | 0 | 0 | 1 | 1 |
| Rainy days | 18 | 19 | 27 | 28 | 31 | 30 | 31 | 26 | 30 | 31 | 29 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Diddeniya is at