Average annual temperature is 12.6 °C
Absolute maximum temperature: 33.7 °C
Absolute minimum temperature: -5.7 °C
Number of sunny days: 211 days
Number of rainy days: 151 days
Number of snow days: 3 days
Look at detailed online map of Grootdam
* Weather data for Grootdam 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) | 31.7 | 28.5 | 27.1 | 24.9 | 21.3 | 16.4 | 18.7 | 20.9 | 27.0 | 28.4 | 33.7 | 32.2 |
| Average daytime temperature (°C) | 25.5 | 23.1 | 23.5 | 19.4 | 14.5 | 11.1 | 11.6 | 15.9 | 17.7 | 19.8 | 25.5 | 24.4 |
| Average temperature (°C) | 18.7 | 16.8 | 16.2 | 12.6 | 8.6 | 5.6 | 5.6 | 8.8 | 10.8 | 12.7 | 17.9 | 16.7 |
| Average night temperature (°C) | 12.8 | 11.6 | 10.2 | 6.3 | 3.8 | 1.2 | 0.4 | 2.4 | 3.7 | 6.2 | 10.2 | 10.6 |
| Absolute minimum temperature (°C) | 5.6 | 7.1 | 3.1 | -0.3 | -2.3 | -3.1 | -4.7 | -4.7 | -5.7 | -1.1 | 3.3 | 6.5 |
| 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 | 14.0 | 14.0 |
| Daylight mean duration (h) | 13.9 | 13.2 | 12.3 | 11.3 | 10.5 | 10.1 | 10.3 | 11.0 | 11.9 | 12.9 | 13.7 | 14.2 |
| 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 | 14.0 |
| Sunshine mean duration (h) | 11.6 | 10.7 | 10.8 | 9.8 | 8.1 | 8.6 | 8.7 | 9.8 | 9.8 | 10.6 | 11.8 | 11.2 |
| Precipitation (mm) | 102 | 112 | 39 | 30 | 93 | 21 | 20 | 5 | 57 | 33 | 50 | 88 |
| Sunny days | 12 | 7 | 12 | 22 | 21 | 21 | 24 | 27 | 23 | 17 | 17 | 8 |
| Rainy days | 19 | 21 | 19 | 8 | 10 | 9 | 4 | 4 | 7 | 14 | 13 | 23 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Grootdam is at