Average annual temperature is 21.8 °C
Absolute maximum temperature: 42.0 °C
Absolute minimum temperature: 10.4 °C
Number of sunny days: 162 days
Number of rainy days: 203 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) | 39.3 | 36.0 | 34.3 | 32.9 | 31.0 | 29.3 | 28.6 | 31.3 | 38.1 | 33.3 | 42.0 | 34.9 |
| Average daytime temperature (°C) | 30.2 | 28.4 | 28.3 | 27.3 | 24.2 | 23.5 | 22.6 | 23.8 | 27.1 | 24.8 | 28.6 | 27.7 |
| Average temperature (°C) | 25.2 | 25.0 | 24.3 | 22.8 | 20.3 | 18.8 | 17.6 | 18.9 | 21.1 | 20.7 | 23.4 | 23.6 |
| Average night temperature (°C) | 21.4 | 22.2 | 21.3 | 19.0 | 16.8 | 14.5 | 13.1 | 14.9 | 16.5 | 17.5 | 19.1 | 20.1 |
| Absolute minimum temperature (°C) | 17.2 | 19.9 | 16.2 | 15.0 | 12.0 | 11.6 | 10.4 | 10.6 | 10.5 | 13.4 | 12.8 | 16.6 |
| 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 | 13.5 | 13.9 |
| 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) | 11.0 | 8.6 | 10.2 | 9.6 | 8.2 | 9.2 | 8.1 | 8.9 | 9.5 | 7.9 | 10.1 | 7.8 |
| Precipitation (mm) | 101 | 239 | 79 | 35 | 207 | 12 | 75 | 16 | 31 | 194 | 46 | 210 |
| Sunny days | 20 | 4 | 6 | 15 | 13 | 18 | 19 | 19 | 13 | 8 | 18 | 9 |
| Rainy days | 11 | 24 | 25 | 15 | 18 | 12 | 12 | 12 | 17 | 23 | 12 | 22 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Alton is at