Average annual temperature is 27.8 °C
Absolute maximum temperature: 34.7 °C
Absolute minimum temperature: 20.3 °C
Number of sunny days: 109 days
Number of rainy days: 256 days
Look at detailed online map of Kantharmadam South West
* Weather data for Kantharmadam South West 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) | 28.2 | 31.1 | 32.8 | 34.7 | 32.1 | 32.8 | 33.5 | 33.2 | 31.5 | 33.1 | 30.8 | 29.4 |
| Average daytime temperature (°C) | 27.6 | 28.5 | 30.9 | 32.4 | 30.8 | 31.3 | 30.9 | 31.3 | 30.4 | 30.6 | 29.1 | 28.4 |
| Average temperature (°C) | 25.1 | 25.5 | 27.8 | 29.2 | 29.2 | 29.5 | 29.0 | 29.0 | 28.6 | 28.0 | 26.2 | 26.2 |
| Average night temperature (°C) | 22.8 | 22.9 | 25.4 | 26.6 | 27.8 | 28.1 | 27.6 | 27.3 | 27.1 | 25.5 | 23.9 | 24.6 |
| Absolute minimum temperature (°C) | 20.3 | 20.3 | 24.1 | 24.9 | 24.8 | 25.7 | 27.0 | 26.8 | 25.4 | 23.6 | 23.0 | 23.6 |
| 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) | 11.6 | 11.8 | 12.1 | 12.3 | 12.6 | 12.7 | 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) | 9.7 | 10.2 | 11.1 | 11.1 | 9.4 | 10.2 | 9.6 | 11.3 | 10.6 | 10.5 | 8.0 | 8.4 |
| Precipitation (mm) | 34 | 106 | 28 | 62 | 83 | 83 | 44 | 8 | 35 | 143 | 553 | 275 |
| Sunny days | 16 | 17 | 9 | 9 | 13 | 12 | 8 | 22 | 2 | 0 | 0 | 1 |
| Rainy days | 15 | 11 | 22 | 21 | 18 | 18 | 23 | 9 | 28 | 31 | 30 | 30 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Kantharmadam South West is at