Johannesburg Climate — Average Highs, Lows & Rainfall by Month
Johannesburg has a temperate climate with four distinct seasons. Daytime temperatures average 25°C / 78°F in January, the warmest month, and drop to 17°C / 63°F in July, the coldest. Overnight lows in July average 4°C / 39°F. Johannesburg receives about 696 mm of rain a year across roughly 100 wet days, with December the wettest month.
Averages for 2021–2025 · Open-Meteo Historical Weather API (ERA5 reanalysis) · Updated 2026-10-05
Monthly averages in Johannesburg
Average daytime high, overnight low and rainfall for each month of the year.
| Month | Avg high | Avg low | Rainfall | Wet days |
|---|---|---|---|---|
| January | 25°C / 78°F | 15°C / 58°F | 120 mm | 15 |
| February | 25°C / 77°F | 15°C / 58°F | 129 mm | 16 |
| March | 24°C / 75°F | 13°C / 56°F | 51 mm | 11 |
| April | 21°C / 70°F | 10°C / 51°F | 66 mm | 7 |
| May | 20°C / 67°F | 8°C / 46°F | 19 mm | 3 |
| June | 17°C / 62°F | 5°C / 40°F | 12 mm | 2 |
| July | 17°C / 63°F | 4°C / 39°F | 2 mm | 0 |
| August | 21°C / 69°F | 7°C / 44°F | 8 mm | 1 |
| September | 25°C / 77°F | 11°C / 51°F | 15 mm | 4 |
| October | 26°C / 78°F | 12°C / 54°F | 44 mm | 8 |
| November | 25°C / 77°F | 13°C / 56°F | 87 mm | 14 |
| December | 25°C / 77°F | 15°C / 58°F | 142 mm | 19 |
Best time to visit Johannesburg
September, October, March offer the most comfortable weather in Johannesburg: mild daytime temperatures with the year's lowest rainfall — September averages 25°C (77°F); October averages 26°C (78°F); March averages 24°C (75°F).
Johannesburg climate FAQ
- What is the hottest month in Johannesburg?
- January is the hottest month in Johannesburg, with average daytime highs of 25°C / 78°F and overnight lows of 15°C / 58°F (averages for 2021–2025).
- What is the coldest month in Johannesburg?
- July is the coldest month in Johannesburg, with average highs of 17°C / 63°F and lows of 4°C / 39°F.
- How much rain does Johannesburg get a year?
- Johannesburg receives about 696 mm of rainfall a year, spread over roughly 100 wet days. December is the wettest month (142 mm on average) and July the driest (2 mm).
- When is the best time to visit Johannesburg?
- September, October, March are the most comfortable months in Johannesburg: mild daytime temperatures with the least rainfall of the year.
Want today's conditions instead of averages?
See live weather in Johannesburg →Source: Open-Meteo Historical Weather API (ERA5 reanalysis), Open-Meteo. Averages are daily means across 2021–2025 and are rounded for display — for a live forecast see the Johannesburg weather page.