Average annual temperature is 26.7 °C
Absolute maximum temperature: 38.2 °C
Absolute minimum temperature: 18.7 °C
Number of sunny days: 75 days
Number of rainy days: 290 days
Look at detailed online map of Mahanetiyawa
* Weather data for Mahanetiyawa 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) | 29.1 | 31.1 | 35.5 | 36.9 | 36.2 | 35.7 | 37.9 | 38.2 | 35.8 | 34.0 | 31.3 | 31.7 |
| Average daytime temperature (°C) | 27.7 | 29.2 | 32.1 | 34.4 | 33.0 | 34.3 | 34.5 | 36.2 | 33.5 | 32.1 | 29.5 | 28.6 |
| Average temperature (°C) | 23.7 | 24.5 | 26.2 | 27.5 | 27.7 | 29.0 | 28.9 | 28.9 | 27.7 | 25.9 | 24.9 | 24.9 |
| Average night temperature (°C) | 20.9 | 21.3 | 22.7 | 23.5 | 24.7 | 25.6 | 25.5 | 24.8 | 24.4 | 23.0 | 22.5 | 22.8 |
| Absolute minimum temperature (°C) | 18.7 | 19.2 | 21.8 | 21.9 | 22.9 | 24.5 | 24.5 | 23.5 | 23.3 | 22.1 | 22.0 | 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 | 12.6 | 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) | 9.2 | 9.9 | 10.6 | 10.3 | 9.0 | 10.6 | 9.5 | 10.7 | 9.7 | 8.7 | 6.7 | 7.1 |
| Precipitation (mm) | 117 | 92 | 72 | 146 | 130 | 25 | 25 | 115 | 70 | 457 | 551 | 307 |
| Sunny days | 12 | 13 | 5 | 7 | 5 | 7 | 12 | 12 | 2 | 0 | 0 | 0 |
| Rainy days | 19 | 15 | 26 | 23 | 26 | 23 | 19 | 19 | 28 | 31 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Mahanetiyawa is at