Average annual temperature is 26.9 °C
Absolute maximum temperature: 40.1 °C
Absolute minimum temperature: 18.1 °C
Number of sunny days: 60 days
Number of rainy days: 305 days
Look at detailed online map of Demettanella
* Weather data for Demettanella 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) | 28.8 | 30.0 | 32.7 | 34.6 | 35.7 | 36.7 | 39.7 | 40.1 | 37.7 | 33.0 | 31.2 | 30.8 |
| Average daytime temperature (°C) | 27.7 | 28.5 | 30.1 | 32.6 | 32.7 | 35.6 | 35.4 | 37.7 | 34.0 | 30.5 | 29.5 | 28.7 |
| Average temperature (°C) | 23.8 | 24.5 | 25.6 | 27.1 | 27.7 | 29.9 | 29.7 | 30.2 | 28.1 | 25.8 | 25.2 | 25.0 |
| Average night temperature (°C) | 20.7 | 21.5 | 22.4 | 23.4 | 24.1 | 25.5 | 25.0 | 24.9 | 24.3 | 22.9 | 22.8 | 22.8 |
| Absolute minimum temperature (°C) | 18.1 | 18.6 | 21.7 | 22.1 | 23.1 | 24.3 | 23.0 | 23.9 | 22.9 | 22.2 | 22.2 | 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 | 12.5 | 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) | 8.2 | 8.9 | 9.2 | 10.2 | 9.4 | 10.7 | 9.4 | 10.7 | 8.5 | 8.3 | 7.2 | 6.6 |
| Precipitation (mm) | 243 | 198 | 171 | 118 | 133 | 26 | 22 | 52 | 82 | 336 | 491 | 483 |
| Sunny days | 7 | 4 | 3 | 6 | 8 | 8 | 12 | 9 | 2 | 1 | 0 | 0 |
| Rainy days | 24 | 24 | 28 | 24 | 23 | 22 | 19 | 22 | 28 | 30 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Demettanella is at