Click on a day for an hourly weather forecast
The temperatures in Johannesburg in September are comfortable with low of 14°C and and high up to 26°C.
The wather in Johannesburg in September can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
Our weather forecast can give you a great sense of what weather to expect in Johannesburg in September 2025.
If you’re planning to visit Johannesburg in the near future, we highly recommend that you review the 14 day weather forecast for Johannesburg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 28° / 18° | 8 | 23 | 0 | 163 mm | Good | Johannesburg in January |
| February | 28° / 17° | 6 | 22 | 0 | 125 mm | Perfect | Johannesburg in February |
| March | 27° / 16° | 6 | 25 | 0 | 90 mm | Perfect | Johannesburg in March |
| April | 24° / 14° | 3 | 27 | 0 | 50 mm | Perfect | Johannesburg in April |
| May | 22° / 12° | 1 | 30 | 0 | 10 mm | Good | Johannesburg in May |
| June | 18° / 8° | 1 | 29 | 0 | 6 mm | Good | Johannesburg in June |
| July | 18° / 8° | 0 | 31 | 0 | 1 mm | Good | Johannesburg in July |
| August | 22° / 11° | 0 | 31 | 0 | 3 mm | Good | Johannesburg in August |
| September | 26° / 14° | 1 | 29 | 0 | 12 mm | Perfect | Johannesburg in September |
| October | 28° / 16° | 5 | 26 | 0 | 84 mm | Perfect | Johannesburg in October |
| November | 28° / 17° | 8 | 22 | 0 | 121 mm | Good | Johannesburg in November |
| December | 28° / 17° | 8 | 23 | 0 | 136 mm | Good | Johannesburg in December |