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January is the hottest month in Johannesburg, with an average high of 26°C / 79°F; July is the coldest (18°C / 64°F). December is the wettest month, averaging 134 mm / 5.3 in of precipitation.
| Month | High °C / °F | Low °C / °F | Precip mm / in | Wet days |
|---|---|---|---|---|
| Jan | 26 / 79 | 15 / 58 | 117 / 4.6 | 10 |
| Feb | 26 / 79 | 15 / 58 | 102 / 4.0 | 8 |
| Mar | 25 / 77 | 13 / 56 | 81 / 3.2 | 7 |
| Apr | 23 / 73 | 10 / 51 | 31 / 1.2 | 4 |
| May | 20 / 68 | 7 / 45 | 24 / 0.9 | 2 |
| Jun | 18 / 64 | 4 / 40 | 9 / 0.4 | 1 |
| Jul | 18 / 64 | 4 / 38 | 4 / 0.2 | 0 |
| Aug | 21 / 69 | 6 / 43 | 15 / 0.6 | 1 |
| Sep | 24 / 76 | 10 / 49 | 19 / 0.7 | 2 |
| Oct | 26 / 78 | 12 / 53 | 64 / 2.5 | 7 |
| Nov | 26 / 78 | 13 / 55 | 81 / 3.2 | 9 |
| Dec | 26 / 79 | 14 / 57 | 134 / 5.3 | 11 |
Extremes since 1973: highest 37°C / 99°F (January 21, 1975), lowest -7°C / 19°F (June 26, 1992).
Daylight lasts about 13.6 hours in December and 10.4 hours in June.
Data: Meteostat — Johannesburg Airport, 1991–2020 averages.
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