Average annual temperature is 28.0 °C
Absolute maximum temperature: 35.3 °C
Absolute minimum temperature: 21.2 °C
Number of sunny days: 114 days
Number of rainy days: 251 days
Look at detailed online map of Nelliyan
* Weather data for Nelliyan 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) | 28.0 | 30.3 | 32.3 | 33.6 | 32.7 | 33.3 | 35.2 | 35.3 | 33.3 | 34.4 | 30.4 | 29.6 |
| Average daytime temperature (°C) | 27.3 | 28.1 | 30.4 | 32.1 | 31.0 | 31.7 | 32.2 | 32.9 | 31.4 | 31.3 | 28.9 | 28.2 |
| Average temperature (°C) | 25.4 | 25.7 | 27.8 | 29.3 | 29.3 | 29.7 | 29.5 | 29.6 | 29.0 | 28.4 | 26.3 | 26.3 |
| Average night temperature (°C) | 23.6 | 23.4 | 25.7 | 26.7 | 27.9 | 28.1 | 27.7 | 27.3 | 27.2 | 25.7 | 24.0 | 24.8 |
| Absolute minimum temperature (°C) | 21.5 | 21.2 | 24.6 | 25.0 | 25.2 | 25.2 | 27.0 | 26.7 | 25.7 | 23.7 | 23.1 | 23.5 |
| 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) | 11.6 | 11.8 | 12.1 | 12.3 | 12.6 | 12.7 | 12.6 | 12.4 | 12.2 | 11.9 | 11.7 | 11.6 |
| 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) | 9.8 | 10.2 | 11.2 | 11.1 | 9.5 | 10.1 | 9.4 | 11.3 | 10.6 | 10.6 | 8.0 | 8.2 |
| Precipitation (mm) | 26 | 102 | 36 | 59 | 76 | 60 | 34 | 9 | 57 | 125 | 569 | 275 |
| Sunny days | 19 | 18 | 8 | 7 | 14 | 15 | 9 | 17 | 3 | 3 | 0 | 1 |
| Rainy days | 12 | 10 | 23 | 23 | 17 | 15 | 22 | 14 | 27 | 28 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Nelliyan is at