Average annual temperature is 20.7 °C
Absolute maximum temperature: 32.0 °C
Absolute minimum temperature: 7.9 °C
Number of sunny days: 165 days
Number of rainy days: 200 days
Look at detailed online map of St Helena Island
* Weather data for St Helena Island Australia is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 30.1 | 30.2 | 30.2 | 28.2 | 24.5 | 24.1 | 24.3 | 26.3 | 26.9 | 28.3 | 31.6 | 32.0 |
| Average daytime temperature (°C) | 27.0 | 27.6 | 27.8 | 25.0 | 21.8 | 21.3 | 21.1 | 22.3 | 23.3 | 25.3 | 25.7 | 28.8 |
| Average temperature (°C) | 24.1 | 24.3 | 24.4 | 20.9 | 16.6 | 16.3 | 16.1 | 17.5 | 19.1 | 21.3 | 22.5 | 25.3 |
| Average night temperature (°C) | 20.9 | 21.2 | 21.5 | 17.0 | 12.3 | 12.1 | 11.6 | 12.8 | 14.8 | 17.1 | 19.6 | 22.1 |
| Absolute minimum temperature (°C) | 18.3 | 18.0 | 17.0 | 13.8 | 8.5 | 7.9 | 8.0 | 9.1 | 11.9 | 14.0 | 16.1 | 17.8 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 |
| Daylight mean duration (h) | 13.6 | 13.0 | 12.2 | 11.4 | 10.8 | 10.4 | 10.6 | 11.2 | 11.9 | 12.7 | 13.5 | 13.8 |
| Daylight minimum duration (h) | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 |
| Sunshine mean duration (h) | 10.4 | 11.1 | 9.2 | 9.8 | 9.1 | 9.0 | 8.5 | 10.0 | 10.7 | 11.5 | 10.4 | 11.3 |
| Precipitation (mm) | 74 | 88 | 143 | 32 | 84 | 16 | 37 | 18 | 29 | 12 | 124 | 144 |
| Sunny days | 8 | 12 | 5 | 13 | 23 | 22 | 25 | 14 | 14 | 17 | 6 | 6 |
| Rainy days | 23 | 16 | 26 | 17 | 8 | 8 | 6 | 17 | 16 | 14 | 24 | 25 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in St Helena Island is at