Average annual temperature is 26.3 °C
Absolute maximum temperature: 36.1 °C
Absolute minimum temperature: 18.9 °C
Number of sunny days: 42 days
Number of rainy days: 323 days
Look at detailed online map of Bamunakotuwa
* Weather data for Bamunakotuwa 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) | 31.0 | 32.7 | 35.1 | 36.1 | 33.7 | 32.3 | 32.1 | 34.8 | 31.9 | 32.5 | 32.5 | 31.5 |
| Average daytime temperature (°C) | 29.4 | 30.6 | 32.9 | 33.8 | 31.2 | 30.7 | 30.1 | 32.8 | 29.4 | 30.0 | 30.2 | 29.8 |
| Average temperature (°C) | 24.6 | 25.6 | 27.1 | 27.4 | 27.2 | 27.0 | 26.7 | 27.8 | 25.7 | 25.5 | 25.4 | 25.7 |
| Average night temperature (°C) | 21.0 | 21.5 | 23.2 | 23.6 | 24.6 | 24.3 | 24.1 | 24.5 | 23.4 | 22.9 | 22.8 | 23.2 |
| Absolute minimum temperature (°C) | 18.9 | 18.9 | 22.1 | 22.5 | 23.1 | 22.4 | 22.7 | 23.5 | 22.4 | 22.0 | 21.9 | 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 | 12.5 | 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) | 9.6 | 9.9 | 10.4 | 10.0 | 9.0 | 10.0 | 9.3 | 10.9 | 7.8 | 7.9 | 7.4 | 7.9 |
| Precipitation (mm) | 72 | 78 | 127 | 211 | 154 | 110 | 128 | 28 | 222 | 371 | 621 | 273 |
| Sunny days | 14 | 13 | 4 | 1 | 0 | 0 | 1 | 4 | 1 | 0 | 0 | 4 |
| Rainy days | 17 | 15 | 27 | 29 | 31 | 30 | 30 | 27 | 29 | 31 | 30 | 27 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Bamunakotuwa is at