Average annual temperature is 17.1 °C
Absolute maximum temperature: 33.4 °C
Absolute minimum temperature: -1.1 °C
Number of sunny days: 232 days
Number of rainy days: 133 days
Look at detailed online map of Koster
* Weather data for Koster 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) | 30.8 | 28.3 | 28.9 | 25.3 | 24.5 | 22.1 | 23.7 | 28.3 | 31.5 | 33.3 | 33.4 | 32.1 |
| Average daytime temperature (°C) | 26.4 | 24.0 | 24.4 | 22.8 | 19.4 | 18.4 | 16.9 | 21.0 | 26.3 | 27.2 | 28.0 | 26.9 |
| Average temperature (°C) | 20.9 | 19.1 | 19.0 | 16.8 | 13.3 | 11.4 | 10.6 | 13.7 | 18.3 | 19.7 | 21.4 | 21.2 |
| Average night temperature (°C) | 15.3 | 14.9 | 13.9 | 11.3 | 8.5 | 5.4 | 4.9 | 6.8 | 10.5 | 12.8 | 14.9 | 15.5 |
| Absolute minimum temperature (°C) | 12.3 | 12.8 | 10.5 | 7.3 | 3.8 | 2.0 | -1.1 | 0.3 | 1.9 | 6.6 | 5.1 | 11.1 |
| 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) | 13.5 | 13.0 | 12.2 | 11.5 | 10.9 | 10.5 | 10.7 | 11.2 | 11.9 | 12.7 | 13.4 | 13.7 |
| 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) | 11.9 | 9.5 | 10.5 | 10.4 | 9.5 | 9.6 | 9.5 | 10.3 | 11.1 | 10.5 | 10.9 | 11.1 |
| Precipitation (mm) | 20 | 127 | 34 | 8 | 31 | 0 | 10 | 0 | 0 | 55 | 35 | 75 |
| Sunny days | 16 | 5 | 10 | 21 | 16 | 28 | 28 | 30 | 29 | 21 | 16 | 12 |
| Rainy days | 15 | 23 | 21 | 9 | 15 | 2 | 3 | 1 | 1 | 10 | 14 | 19 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Koster is at