Average annual temperature is 17.5 °C
Absolute maximum temperature: 40.2 °C
Absolute minimum temperature: -3.4 °C
Number of sunny days: 263 days
Number of rainy days: 102 days
Look at detailed online map of Alton
* Weather data for Alton 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) | 34.7 | 35.3 | 31.5 | 28.3 | 26.9 | 23.3 | 25.1 | 27.7 | 33.1 | 36.1 | 40.2 | 37.6 |
| Average daytime temperature (°C) | 31.3 | 28.9 | 28.0 | 24.7 | 20.0 | 16.9 | 17.8 | 21.5 | 25.2 | 29.1 | 32.7 | 31.2 |
| Average temperature (°C) | 24.4 | 22.4 | 20.9 | 16.1 | 12.3 | 8.6 | 9.0 | 11.9 | 15.8 | 20.4 | 24.6 | 23.7 |
| Average night temperature (°C) | 17.5 | 16.2 | 14.2 | 8.8 | 5.9 | 2.0 | 1.7 | 3.5 | 7.0 | 11.8 | 15.9 | 16.4 |
| Absolute minimum temperature (°C) | 11.6 | 11.0 | 8.6 | 3.9 | -0.6 | -1.4 | -3.4 | -2.2 | 1.5 | 7.7 | 6.3 | 11.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 13.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 |
| Daylight mean duration (h) | 13.7 | 13.1 | 12.3 | 11.4 | 10.7 | 10.3 | 10.5 | 11.1 | 11.9 | 12.8 | 13.6 | 14.0 |
| 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) | 12.4 | 10.9 | 10.7 | 10.2 | 8.9 | 9.2 | 9.1 | 10.0 | 10.3 | 10.7 | 11.6 | 11.0 |
| Precipitation (mm) | 49 | 60 | 38 | 22 | 53 | 7 | 1 | 0 | 22 | 33 | 10 | 106 |
| Sunny days | 19 | 12 | 16 | 23 | 20 | 26 | 27 | 30 | 26 | 24 | 24 | 16 |
| Rainy days | 12 | 16 | 15 | 7 | 11 | 4 | 4 | 1 | 4 | 7 | 6 | 15 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Alton is at