Average annual temperature is 15.0 °C
Absolute maximum temperature: 34.8 °C
Absolute minimum temperature: 0.7 °C
Number of sunny days: 178 days
Number of rainy days: 187 days
Look at detailed online map of Merthley
* Weather data for Merthley 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) | 32.7 | 27.3 | 28.4 | 26.9 | 24.7 | 23.2 | 23.7 | 27.2 | 32.3 | 34.8 | 33.6 | 31.1 |
| Average daytime temperature (°C) | 25.7 | 22.3 | 23.4 | 22.5 | 17.9 | 17.5 | 16.1 | 19.7 | 24.0 | 21.0 | 24.8 | 23.2 |
| Average temperature (°C) | 19.1 | 17.6 | 17.6 | 15.6 | 12.5 | 11.1 | 9.8 | 12.1 | 15.2 | 14.3 | 17.9 | 17.1 |
| Average night temperature (°C) | 13.7 | 14.2 | 13.3 | 10.7 | 8.0 | 6.0 | 4.5 | 5.9 | 8.5 | 9.1 | 12.3 | 12.7 |
| Absolute minimum temperature (°C) | 5.8 | 11.4 | 8.1 | 6.6 | 2.2 | 2.0 | 1.5 | 0.7 | 1.3 | 2.0 | 4.0 | 8.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 13.0 | 13.0 | 12.0 | 11.0 | 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) | 10.5 | 8.1 | 10.0 | 9.6 | 8.6 | 9.3 | 8.5 | 9.4 | 9.9 | 8.2 | 10.0 | 8.2 |
| Precipitation (mm) | 154 | 237 | 54 | 16 | 61 | 2 | 8 | 6 | 14 | 189 | 45 | 218 |
| Sunny days | 14 | 3 | 8 | 21 | 19 | 28 | 21 | 23 | 17 | 13 | 6 | 5 |
| Rainy days | 17 | 25 | 23 | 9 | 12 | 2 | 10 | 8 | 13 | 18 | 24 | 26 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Merthley is at