Johannesburg is warmest in October, averaging 29° by day and 12° at night. The wettest month is December with 115 mm, and the year brings about 644 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 28° | 15° | 99 mm | 13.5 h | Beach weather |
| February | 28° | 15° | 92 mm | 12.9 h | Beach weather |
| March | 28° | 14° | 65 mm | 12.2 h | Beach weather |
| April | 24° | 10° | 69 mm | 11.4 h | Sightseeing |
| May | 22° | 7° | 16 mm | 10.7 h | Sightseeing |
| June | 19° | 3° | 9 mm | 10.4 h | Sightseeing |
| July | 19° | 3° | 3 mm | 10.5 h | Sightseeing |
| August | 23° | 6° | 3 mm | 11.1 h | Sightseeing |
| September | 27° | 9° | 12 mm | 11.9 h | Beach weather |
| October | 29° | 12° | 62 mm | 12.6 h | Beach weather |
| November | 29° | 13° | 99 mm | 13.3 h | Beach weather |
| December | 29° | 15° | 115 mm | 13.6 h | Mild |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: January, February, March, September, October and November — highs around 28°, nights no colder than 9°, and at most 99 mm of rain in a month.
Walking the city: April, May, June, July and August — highs of 19–24° and no more than 69 mm of rain a month.