Average annual temperature is 26.1 °C
Absolute maximum temperature: 33.7 °C
Absolute minimum temperature: 18.1 °C
Number of sunny days: 36 days
Number of rainy days: 329 days
Look at detailed online map of Brahmanayagama
* Weather data for Brahmanayagama 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) | 31.5 | 33.0 | 32.6 | 33.7 | 33.1 | 31.8 | 31.8 | 33.5 | 31.2 | 31.1 | 31.1 | 31.4 |
| Average daytime temperature (°C) | 30.4 | 30.9 | 31.0 | 31.6 | 30.7 | 30.8 | 30.2 | 32.1 | 29.3 | 29.0 | 29.7 | 29.6 |
| Average temperature (°C) | 24.9 | 25.5 | 26.1 | 26.6 | 27.1 | 27.1 | 26.7 | 27.7 | 25.5 | 25.1 | 25.2 | 25.6 |
| Average night temperature (°C) | 20.8 | 21.7 | 22.7 | 23.2 | 24.5 | 24.4 | 24.1 | 24.4 | 23.1 | 22.6 | 22.4 | 22.8 |
| Absolute minimum temperature (°C) | 18.1 | 20.5 | 21.2 | 22.1 | 23.4 | 22.5 | 22.4 | 23.1 | 22.6 | 21.5 | 21.7 | 21.6 |
| 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) | 11.8 | 11.9 | 12.1 | 12.3 | 12.4 | 12.5 | 12.4 | 12.3 | 12.2 | 12.0 | 11.8 | 11.8 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 9.5 | 9.6 | 10.0 | 10.2 | 9.3 | 10.7 | 9.8 | 10.8 | 8.3 | 7.0 | 7.5 | 7.7 |
| Precipitation (mm) | 107 | 152 | 202 | 169 | 135 | 75 | 91 | 50 | 258 | 426 | 482 | 350 |
| Sunny days | 7 | 7 | 2 | 1 | 3 | 0 | 5 | 8 | 0 | 0 | 0 | 3 |
| Rainy days | 24 | 21 | 29 | 29 | 28 | 30 | 26 | 23 | 30 | 31 | 30 | 28 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Brahmanayagama is at