Average annual temperature is 22.6 °C
Absolute maximum temperature: 30.6 °C
Absolute minimum temperature: 15.4 °C
Number of sunny days: 32 days
Number of rainy days: 333 days
Look at detailed online map of Goonambilwatta
* Weather data for Goonambilwatta 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) | 26.3 | 27.4 | 29.9 | 30.6 | 29.5 | 28.0 | 27.1 | 28.8 | 27.0 | 27.9 | 27.1 | 27.7 |
| Average daytime temperature (°C) | 25.0 | 26.1 | 27.5 | 28.8 | 27.0 | 26.4 | 25.2 | 27.4 | 25.3 | 25.8 | 26.2 | 25.7 |
| Average temperature (°C) | 21.0 | 21.9 | 23.0 | 23.8 | 23.3 | 23.2 | 22.3 | 23.0 | 22.1 | 22.2 | 22.4 | 22.4 |
| Average night temperature (°C) | 17.8 | 18.5 | 19.6 | 20.0 | 20.7 | 20.9 | 20.1 | 19.8 | 20.1 | 19.8 | 20.1 | 20.2 |
| Absolute minimum temperature (°C) | 15.4 | 15.8 | 18.4 | 18.7 | 19.4 | 20.0 | 18.7 | 18.3 | 18.7 | 18.2 | 19.2 | 18.6 |
| 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) | 9.2 | 9.6 | 10.1 | 10.2 | 9.3 | 10.5 | 9.2 | 10.8 | 8.7 | 7.7 | 7.4 | 7.6 |
| Precipitation (mm) | 60 | 58 | 95 | 119 | 146 | 169 | 208 | 79 | 167 | 437 | 771 | 258 |
| Sunny days | 10 | 8 | 1 | 5 | 1 | 0 | 0 | 2 | 0 | 1 | 1 | 3 |
| Rainy days | 21 | 20 | 30 | 25 | 30 | 30 | 31 | 29 | 30 | 30 | 29 | 28 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Goonambilwatta is at