Average annual temperature is 21.3 °C
Absolute maximum temperature: 39.3 °C
Absolute minimum temperature: -1.2 °C
Number of sunny days: 290 days
Number of rainy days: 75 days
Look at detailed online map of Harrow
* Weather data for Harrow 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) | 37.1 | 37.0 | 35.1 | 31.6 | 30.7 | 26.2 | 28.2 | 30.9 | 35.2 | 38.8 | 39.1 | 39.3 |
| Average daytime temperature (°C) | 33.9 | 31.6 | 31.4 | 28.5 | 24.6 | 20.6 | 21.2 | 24.9 | 27.7 | 32.3 | 34.6 | 34.2 |
| Average temperature (°C) | 28.0 | 25.5 | 24.4 | 20.5 | 17.0 | 12.2 | 13.2 | 16.2 | 19.2 | 24.4 | 27.6 | 27.5 |
| Average night temperature (°C) | 20.6 | 19.2 | 17.3 | 12.8 | 9.4 | 4.6 | 5.5 | 7.7 | 9.9 | 15.5 | 19.3 | 20.2 |
| Absolute minimum temperature (°C) | 13.6 | 13.9 | 13.0 | 6.3 | 1.9 | 0.3 | -1.2 | 2.4 | 3.2 | 9.2 | 10.1 | 14.3 |
| 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) | 12.7 | 11.2 | 10.8 | 10.5 | 9.6 | 9.6 | 9.7 | 10.3 | 10.9 | 11.3 | 11.8 | 12.0 |
| Precipitation (mm) | 3 | 42 | 11 | 1 | 15 | 0 | 0 | 0 | 3 | 2 | 11 | 69 |
| Sunny days | 25 | 10 | 20 | 23 | 25 | 27 | 31 | 31 | 28 | 28 | 23 | 19 |
| Rainy days | 6 | 18 | 11 | 7 | 6 | 3 | 0 | 0 | 2 | 3 | 7 | 12 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Harrow is at