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Situated largely on the highveld, the big cities of Gauteng benefit from the cooling effects of altitude. Both Johannesburg and Pretoria can become baking hot in summer, but a fresh breeze can often be relied on to take the sting out of a Jo'burg January. At this time of year, cloudless days and plenty of sunshine are common. Winters can get chilly, with freezing temperatures not unknown. It has even been known for Johannesburg to occasionally get a dusting of snow. Early summer (September-October) and autumn (March-April) offer the best weather for a visit.
| Month | Temperature | Rainfall | Humidity | Hrs of sunshine | ||
| Min | Max | AM | PM | |||
| Jan | 14 | 26 | 114 | 75 | 50 | 8 |
| Feb | 14 | 25 | 109 | 78 | 53 | 8 |
| Mar | 13 | 24 | 89 | 79 | 50 | 8 |
| Apr | 10 | 22 | 38 | 74 | 44 | 8 |
| May | 6 | 19 | 25 | 70 | 36 | 9 |
| Jun | 4 | 17 | 8 | 70 | 33 | 9 |
| Jul | 4 | 17 | 8 | 69 | 32 | 9 |
| Aug | 6 | 20 | 8 | 64 | 29 | 10 |
| Sep | 9 | 23 | 23 | 59 | 30 | 10 |
| Oct | 12 | 25 | 56 | 64 | 37 | 9 |
| Nov | 13 | 25 | 107 | 67 | 45 | 8 |
| Dec | 14 | 26 | 125 | 70 | 47 | 8 |
