Average annual temperature is 20.9 °C
Absolute maximum temperature: 41.8 °C
Absolute minimum temperature: 8.6 °C
Number of sunny days: 175 days
Number of rainy days: 190 days
Look at detailed online map of Blackburn
* Weather data for Blackburn 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) | 40.0 | 37.0 | 33.8 | 34.3 | 33.0 | 30.6 | 30.2 | 32.9 | 38.8 | 34.4 | 41.8 | 35.0 |
| Average daytime temperature (°C) | 31.3 | 28.1 | 28.0 | 27.4 | 23.9 | 23.5 | 22.8 | 24.1 | 27.0 | 24.5 | 28.3 | 27.3 |
| Average temperature (°C) | 25.0 | 23.9 | 23.4 | 21.8 | 19.2 | 17.8 | 16.9 | 17.8 | 20.2 | 19.6 | 22.6 | 22.6 |
| Average night temperature (°C) | 20.0 | 20.8 | 19.8 | 17.1 | 15.3 | 13.1 | 11.9 | 12.5 | 14.7 | 15.6 | 18.1 | 18.6 |
| Absolute minimum temperature (°C) | 16.1 | 18.5 | 14.8 | 12.5 | 11.0 | 9.7 | 9.2 | 8.6 | 9.4 | 11.1 | 11.2 | 14.7 |
| 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) | 10.6 | 7.9 | 9.2 | 8.9 | 7.7 | 9.0 | 8.1 | 8.4 | 8.7 | 7.4 | 9.5 | 7.3 |
| Precipitation (mm) | 182 | 274 | 61 | 22 | 83 | 8 | 22 | 20 | 36 | 185 | 48 | 208 |
| Sunny days | 17 | 4 | 7 | 20 | 16 | 18 | 23 | 20 | 15 | 11 | 16 | 8 |
| Rainy days | 14 | 24 | 24 | 10 | 15 | 12 | 8 | 11 | 15 | 20 | 14 | 23 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Blackburn is at