Average annual temperature is 27.1 °C
Absolute maximum temperature: 39.2 °C
Absolute minimum temperature: 19.4 °C
Number of sunny days: 36 days
Number of rainy days: 329 days
Look at detailed online map of Siyambalawewa
* Weather data for Siyambalawewa 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) | 28.9 | 29.4 | 33.1 | 35.3 | 35.7 | 37.2 | 39.2 | 38.6 | 36.5 | 32.9 | 32.1 | 32.0 |
| Average daytime temperature (°C) | 27.7 | 28.2 | 30.1 | 32.2 | 33.2 | 35.7 | 35.8 | 36.4 | 33.7 | 31.0 | 29.8 | 28.9 |
| Average temperature (°C) | 24.4 | 24.9 | 26.1 | 27.5 | 28.0 | 29.4 | 29.5 | 29.8 | 27.7 | 26.2 | 25.6 | 25.5 |
| Average night temperature (°C) | 21.5 | 22.0 | 22.9 | 23.8 | 24.2 | 25.0 | 24.8 | 25.0 | 24.3 | 23.2 | 23.0 | 23.1 |
| Absolute minimum temperature (°C) | 19.4 | 20.0 | 22.2 | 22.4 | 22.8 | 24.2 | 23.5 | 23.5 | 23.1 | 22.4 | 22.4 | 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 | 12.5 | 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) | 9.0 | 9.3 | 9.8 | 10.5 | 9.6 | 10.7 | 9.8 | 11.1 | 9.6 | 9.2 | 8.1 | 7.7 |
| Precipitation (mm) | 185 | 139 | 120 | 89 | 145 | 77 | 62 | 59 | 222 | 396 | 513 | 449 |
| Sunny days | 7 | 5 | 6 | 3 | 5 | 1 | 4 | 3 | 1 | 1 | 0 | 0 |
| Rainy days | 24 | 23 | 25 | 27 | 26 | 29 | 27 | 28 | 29 | 30 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Siyambalawewa is at