Average annual temperature is 27.4 °C
Absolute maximum temperature: 39.1 °C
Absolute minimum temperature: 19.8 °C
Number of sunny days: 80 days
Number of rainy days: 285 days
Look at detailed online map of Jayanthiwewa
* Weather data for Jayanthiwewa 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) | 28.8 | 30.0 | 34.0 | 37.0 | 37.2 | 38.4 | 38.7 | 39.1 | 35.9 | 34.5 | 30.9 | 32.3 |
| Average daytime temperature (°C) | 27.4 | 28.4 | 31.0 | 33.7 | 33.8 | 35.5 | 35.5 | 36.8 | 34.0 | 32.1 | 29.3 | 28.7 |
| Average temperature (°C) | 24.6 | 25.2 | 26.8 | 28.2 | 28.5 | 30.0 | 29.6 | 29.5 | 28.4 | 26.7 | 25.5 | 25.7 |
| Average night temperature (°C) | 22.2 | 22.3 | 23.7 | 24.4 | 25.4 | 26.5 | 26.2 | 25.4 | 25.2 | 23.7 | 23.1 | 23.6 |
| Absolute minimum temperature (°C) | 20.2 | 19.8 | 22.7 | 22.8 | 23.6 | 25.5 | 25.1 | 24.4 | 23.9 | 22.9 | 22.3 | 22.8 |
| 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 | 11.8 | 12.1 | 12.3 | 12.5 | 12.6 | 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) | 9.1 | 10.0 | 10.8 | 10.6 | 9.1 | 10.6 | 9.5 | 10.7 | 9.9 | 9.4 | 7.1 | 7.2 |
| Precipitation (mm) | 131 | 93 | 67 | 120 | 133 | 20 | 50 | 101 | 109 | 410 | 556 | 423 |
| Sunny days | 12 | 12 | 5 | 10 | 7 | 10 | 11 | 9 | 2 | 2 | 0 | 0 |
| Rainy days | 19 | 16 | 26 | 20 | 24 | 20 | 20 | 22 | 28 | 29 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Jayanthiwewa is at