Average annual temperature is 26.1 °C
Absolute maximum temperature: 35.9 °C
Absolute minimum temperature: 18.5 °C
Number of sunny days: 36 days
Number of rainy days: 329 days
Look at detailed online map of Opatha
* Weather data for Opatha 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) | 32.2 | 33.8 | 35.2 | 35.9 | 33.2 | 31.6 | 31.1 | 33.3 | 31.0 | 32.3 | 32.0 | 32.1 |
| Average daytime temperature (°C) | 30.0 | 31.2 | 32.9 | 33.6 | 30.8 | 30.0 | 29.7 | 31.6 | 28.9 | 29.6 | 30.3 | 30.1 |
| Average temperature (°C) | 24.7 | 25.6 | 26.9 | 27.2 | 26.9 | 26.6 | 26.3 | 27.3 | 25.3 | 25.3 | 25.1 | 25.7 |
| Average night temperature (°C) | 20.7 | 21.1 | 22.8 | 23.3 | 24.6 | 24.2 | 23.8 | 24.3 | 23.3 | 22.8 | 22.2 | 22.8 |
| Absolute minimum temperature (°C) | 18.7 | 18.5 | 21.9 | 21.4 | 23.3 | 22.5 | 22.2 | 23.3 | 22.0 | 21.8 | 20.6 | 21.9 |
| 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 | 12.5 | 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) | 9.5 | 9.6 | 10.1 | 9.8 | 8.9 | 9.4 | 9.1 | 10.7 | 7.2 | 7.2 | 7.1 | 7.9 |
| Precipitation (mm) | 97 | 91 | 130 | 131 | 190 | 172 | 220 | 59 | 348 | 470 | 655 | 379 |
| Sunny days | 16 | 13 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 3 |
| Rainy days | 15 | 15 | 30 | 30 | 30 | 30 | 31 | 30 | 30 | 30 | 30 | 28 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Opatha is at