Johannesburg, South Africa Climate & Monthly Averages
The climate of Johannesburg
Weather in Johannesburg is shaped by its oceanic climate - expect mild temperatures year-round with regular rainfall. December afternoons typically reach 79°F (26°C), while July highs hover near 63°F (17°C). Annual precipitation averages 23.9 inches (606 mm) over about 86 rainy days.
Climate quick facts
- Hottest month: December - highs near 79°F (26°C)
- Coldest month: July - highs near 63°F (17°C)
- Record high: 97°F (36°C) · Record low: 25°F (-4°C) (2015–2024)
- Wettest month: January (14 rainy days) · Sunniest: January (11.6 h sun/day)
- Climate type: oceanic - mild temperatures year-round with regular rainfall
Temperatures through the year
The warmest stretch of the year centers on December. Highs average 79°F (26°C) and overnight lows stay near 59°F (15°C). The coolest month is July, with typical highs of 63°F (17°C) and lows around 39°F (4°C). Based on 2015–2024 weather data, temperatures have reached as high as 97°F (36°C) and dropped as low as 25°F (-4°C).
Rain, sun and snow
January is usually the wettest month. It brings about 4.6 inches (117 mm) of rain over 14 days, while August is the driest. January brings the most sunshine, averaging 11.6 hours of sun a day.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 78° | 58° | 14 | 4.6 in | 11.6 h/day | 66% |
| February | 77° | 58° | 13 | 4.1 in | 11.0 h/day | 68% |
| March | 76° | 56° | 9 | 2.4 in | 10.7 h/day | 65% |
| April | 71° | 51° | 8 | 2.2 in | 10.1 h/day | 65% |
| May | 68° | 45° | 2 | 0.6 in | 9.8 h/day | 54% |
| June | 63° | 40° | 1 | 0.3 in | 9.8 h/day | 51% |
| July | 63° | 39° | 0 | 0.1 in | 10.2 h/day | 46% |
| August | 70° | 44° | 1 | 0.1 in | 10.6 h/day | 40% |
| September | 76° | 50° | 3 | 0.5 in | 11.2 h/day | 39% |
| October | 79° | 53° | 7 | 1.5 in | 11.1 h/day | 46% |
| November | 79° | 56° | 11 | 3.0 in | 11.5 h/day | 56% |
| December | 79° | 59° | 16 | 4.3 in | 11.3 h/day | 64% |
Johannesburg month by month
Johannesburg weather in January
January brings highs around 78°F (26°C), lows near 58°F (15°C), about 14 wet days - typically the wettest month and the sunniest month of the year in Johannesburg.
Johannesburg weather in February
February brings highs around 77°F (25°C), lows near 58°F (14°C), about 13 wet days.
Johannesburg weather in March
March brings highs around 76°F (24°C), lows near 56°F (13°C), about 9 wet days.
Johannesburg weather in April
April brings highs around 71°F (22°C), lows near 51°F (10°C), about 8 wet days.
Johannesburg weather in May
May brings highs around 68°F (20°C), lows near 45°F (7°C), about 2 wet days.
Johannesburg weather in June
June brings highs around 63°F (17°C), lows near 40°F (4°C), about 1 wet days.
Johannesburg weather in July
July brings highs around 63°F (17°C), lows near 39°F (4°C), about 0 wet days - typically the coldest month of the year in Johannesburg.
Johannesburg weather in August
August brings highs around 70°F (21°C), lows near 44°F (7°C), about 1 wet days - typically the driest month of the year in Johannesburg.
Johannesburg weather in September
September brings highs around 76°F (25°C), lows near 50°F (10°C), about 3 wet days.
Johannesburg weather in October
October brings highs around 79°F (26°C), lows near 53°F (12°C), about 7 wet days.
Johannesburg weather in November
November brings highs around 79°F (26°C), lows near 56°F (13°C), about 11 wet days.
Johannesburg weather in December
December brings highs around 79°F (26°C), lows near 59°F (15°C), about 16 wet days - typically the hottest month of the year in Johannesburg.
Seasons in Johannesburg
Spring (September through November)
Spring in Johannesburg brings comfortable warmth, with daytime highs averaging 78°F (26°C) and nights around 53°F (12°C); expect showers on roughly 21 days across the season.
Summer (December through February)
Summer in Johannesburg is pleasantly warm, with daytime highs averaging 78°F (26°C) and nights around 58°F (15°C); expect showers on roughly 43 days across the season.
Fall (March through May)
Fall in Johannesburg is mild and warm, with daytime highs averaging 71°F (22°C) and nights around 51°F (10°C); expect showers on roughly 19 days across the season.
Winter (June through August)
Winter in Johannesburg is crisp but comfortable, with daytime highs averaging 65°F (18°C) and nights around 41°F (5°C); precipitation is infrequent.
Climate questions, answered
What is the average temperature in Johannesburg?
Is Johannesburg hot in summer?
Is Johannesburg cold in winter?
How many rainy days does Johannesburg get in a year?
Best time to visit Johannesburg
The best time to visit Johannesburg is generally April to September, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window typically sit near 68°F (20°C).
Pack for Johannesburg with rain gear if you travel around January. Evenings can feel noticeably cooler than afternoons - December nights average 59°F (15°C).
Johannesburg temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.