Average annual temperature is 25.0 °C
Absolute maximum temperature: 35.5 °C
Absolute minimum temperature: 14.4 °C
Number of sunny days: 66 days
Number of rainy days: 299 days
Look at detailed online map of Gampaha1
* Weather data for Gampaha1 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) | 29.3 | 29.5 | 32.8 | 33.7 | 33.8 | 34.6 | 34.3 | 35.5 | 30.9 | 28.9 | 28.5 | 28.9 |
| Average daytime temperature (°C) | 28.1 | 28.2 | 29.5 | 30.9 | 30.0 | 32.7 | 31.3 | 33.4 | 28.8 | 27.3 | 27.2 | 27.3 |
| Average temperature (°C) | 23.3 | 23.7 | 24.8 | 25.5 | 25.7 | 27.2 | 26.3 | 27.4 | 24.8 | 23.7 | 23.6 | 24.1 |
| Average night temperature (°C) | 18.8 | 19.2 | 20.8 | 21.5 | 22.2 | 22.8 | 22.3 | 22.5 | 22.2 | 21.3 | 21.0 | 21.3 |
| Absolute minimum temperature (°C) | 14.4 | 14.4 | 19.0 | 19.9 | 20.5 | 21.7 | 21.1 | 21.5 | 21.0 | 20.1 | 19.1 | 19.0 |
| 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 | 12.5 | 12.3 | 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 | 10.0 | 10.0 | 10.0 | 9.2 | 10.8 | 9.9 | 11.1 | 8.9 | 7.8 | 7.6 | 8.2 |
| Precipitation (mm) | 58 | 119 | 104 | 140 | 185 | 56 | 51 | 57 | 111 | 411 | 635 | 284 |
| Sunny days | 16 | 10 | 3 | 2 | 9 | 5 | 6 | 8 | 2 | 0 | 0 | 5 |
| Rainy days | 15 | 18 | 28 | 28 | 22 | 25 | 25 | 23 | 28 | 31 | 30 | 26 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Gampaha1 is at