Average annual temperature is 15.6 °C
Absolute maximum temperature: 34.3 °C
Absolute minimum temperature: -2.7 °C
Number of sunny days: 219 days
Number of rainy days: 145 days
Number of snow days: 1 day
Look at detailed online map of Glen Isla
* Weather data for Glen Isla South Africa is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 32.4 | 30.4 | 28.1 | 26.3 | 24.2 | 20.9 | 22.0 | 23.6 | 30.1 | 33.2 | 34.3 | 32.3 |
| Average daytime temperature (°C) | 27.4 | 24.9 | 25.3 | 22.5 | 18.4 | 15.4 | 15.8 | 19.5 | 23.0 | 25.6 | 27.6 | 26.8 |
| Average temperature (°C) | 20.9 | 19.1 | 18.3 | 15.2 | 11.7 | 8.6 | 8.4 | 11.5 | 14.9 | 17.8 | 20.5 | 20.2 |
| Average night temperature (°C) | 15.0 | 14.1 | 12.6 | 8.8 | 6.6 | 3.2 | 2.3 | 4.5 | 7.3 | 10.5 | 13.4 | 14.6 |
| Absolute minimum temperature (°C) | 9.2 | 8.8 | 7.0 | 3.1 | 0.4 | -0.3 | -2.7 | -2.0 | 0.2 | 5.7 | 5.0 | 10.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 |
| Daylight mean duration (h) | 13.8 | 13.1 | 12.3 | 11.4 | 10.6 | 10.2 | 10.4 | 11.1 | 11.9 | 12.8 | 13.6 | 14.0 |
| Daylight minimum duration (h) | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 |
| Sunshine mean duration (h) | 12.4 | 10.0 | 10.6 | 10.0 | 8.9 | 8.9 | 9.1 | 9.9 | 10.0 | 10.9 | 11.9 | 11.4 |
| Precipitation (mm) | 119 | 131 | 54 | 26 | 45 | 16 | 21 | 3 | 30 | 52 | 38 | 166 |
| Sunny days | 10 | 6 | 11 | 22 | 19 | 25 | 23 | 27 | 24 | 21 | 20 | 11 |
| Rainy days | 21 | 22 | 20 | 8 | 12 | 5 | 7 | 4 | 6 | 10 | 10 | 20 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Glen Isla is at