Average annual temperature is 26.2 °C
Absolute maximum temperature: 35.4 °C
Absolute minimum temperature: 18.8 °C
Number of sunny days: 39 days
Number of rainy days: 326 days
Look at detailed online map of Nelliya
* Weather data for Nelliya 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) | 30.3 | 31.3 | 34.9 | 35.4 | 33.5 | 32.5 | 32.4 | 35.1 | 32.0 | 32.5 | 31.3 | 30.7 |
| Average daytime temperature (°C) | 28.6 | 29.6 | 32.2 | 33.5 | 31.3 | 31.0 | 30.2 | 33.1 | 29.8 | 30.1 | 30.0 | 29.2 |
| Average temperature (°C) | 24.2 | 25.1 | 26.7 | 27.3 | 27.1 | 27.2 | 26.7 | 27.9 | 25.8 | 25.4 | 25.4 | 25.4 |
| Average night temperature (°C) | 20.9 | 21.4 | 22.7 | 23.3 | 24.5 | 24.7 | 24.1 | 24.6 | 23.5 | 22.6 | 22.8 | 23.1 |
| Absolute minimum temperature (°C) | 18.8 | 19.3 | 21.9 | 21.8 | 23.0 | 23.4 | 22.7 | 23.6 | 22.6 | 21.1 | 22.1 | 22.2 |
| 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) | 9.6 | 9.8 | 10.5 | 10.2 | 9.0 | 10.2 | 9.3 | 10.9 | 8.3 | 8.2 | 7.5 | 7.9 |
| Precipitation (mm) | 60 | 63 | 71 | 157 | 160 | 59 | 96 | 29 | 157 | 388 | 479 | 269 |
| Sunny days | 15 | 11 | 3 | 4 | 0 | 1 | 1 | 3 | 0 | 0 | 0 | 1 |
| Rainy days | 16 | 17 | 28 | 26 | 31 | 29 | 30 | 28 | 30 | 31 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Nelliya is at