Average annual temperature is 16.6 °C
Absolute maximum temperature: 33.7 °C
Absolute minimum temperature: -2.6 °C
Number of sunny days: 228 days
Number of rainy days: 137 days
Look at detailed online map of Heidelberg
* Weather data for Heidelberg 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) | 29.9 | 27.6 | 28.5 | 26.3 | 26.4 | 22.6 | 23.1 | 27.9 | 31.1 | 33.7 | 31.9 | 31.6 |
| Average daytime temperature (°C) | 26.9 | 24.2 | 25.1 | 23.7 | 19.8 | 18.2 | 17.3 | 21.3 | 26.1 | 26.5 | 27.1 | 26.5 |
| Average temperature (°C) | 20.7 | 18.9 | 18.9 | 16.8 | 13.2 | 10.6 | 9.8 | 13.2 | 17.7 | 18.7 | 20.3 | 20.5 |
| Average night temperature (°C) | 14.3 | 14.7 | 13.1 | 10.2 | 8.0 | 4.3 | 3.3 | 5.5 | 9.4 | 11.3 | 13.6 | 14.7 |
| Absolute minimum temperature (°C) | 11.2 | 11.6 | 10.1 | 4.6 | 2.5 | 0.8 | -2.0 | -2.6 | 2.8 | 4.2 | 3.1 | 10.8 |
| 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 | 11.5 | 10.8 | 10.5 | 10.7 | 11.2 | 11.9 | 12.7 | 13.4 | 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) | 11.8 | 9.1 | 10.6 | 10.4 | 9.2 | 9.6 | 9.5 | 10.2 | 10.8 | 10.1 | 10.8 | 11.0 |
| Precipitation (mm) | 43 | 127 | 17 | 10 | 68 | 15 | 1 | 0 | 8 | 50 | 46 | 86 |
| Sunny days | 14 | 6 | 14 | 22 | 17 | 27 | 28 | 30 | 28 | 20 | 12 | 10 |
| Rainy days | 17 | 22 | 17 | 8 | 14 | 3 | 3 | 1 | 2 | 11 | 18 | 21 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Heidelberg is at