Johannesburg weather in August
In August, Johannesburg has an average high of 20 °C68 °F and an average low of 3 °C38 °F, with about 7 mm0.3 in of precipitation. It is the 10th warmest month of the year and ranks 11th for precipitation.
How August compares with other months
Compared with July, August is 3.2 °C5.7 °F warmer on average. Compared with September, August is 4.3 °C7.7 °F cooler on average and drier by 9 mm0.3 in. Daylight lasts about 11.2 hours around the middle of the month. Average relative humidity is 44% and the average cloud amount 24%.
Is August a good time to visit Johannesburg?
Yes — August is one of the most comfortable months to visit Johannesburg by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in August
For Johannesburg in August, pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
August in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Johannesburg | 2068 | 338 | 70.3 |
| Alberton | 2170 | 439 | 80.3 |
| Roodepoort | 2069 | 338 | 70.3 |
| Soweto | 2170 | 439 | 80.3 |
| Thembisa | 2170 | 440 | 70.3 |
| Krugersdorp | 2069 | 338 | 60.2 |
| Etwatwa | 2171 | 439 | 70.3 |
| Nigel | 2170 | 439 | 90.3 |
| Pretoria | 2475 | 643 | 50.2 |
Nearby places that are more than 1 °C1.8 °F warmer in August: Alberton, Thembisa, Etwatwa and Pretoria.
Other months in Johannesburg
- January27 °C80 °F / 14 °C56 °F
- February27 °C80 °F / 13 °C56 °F
- March25 °C77 °F / 12 °C53 °F
- April22 °C72 °F / 8 °C47 °F
- May19 °C67 °F / 4 °C40 °F
- June16 °C61 °F / 1 °C34 °F
- July16 °C62 °F / 0 °C33 °F
- August20 °C68 °F / 3 °C38 °F
- September25 °C77 °F / 7 °C45 °F
- October27 °C80 °F / 10 °C50 °F
- November27 °C80 °F / 12 °C53 °F
- December27 °C80 °F / 13 °C56 °F
Frequently asked questions
How warm is Johannesburg in August?
In August the average high in Johannesburg is 20 °C (68 °F) and the average low is 3 °C (38 °F).
Does it rain a lot in Johannesburg in August?
On average about 7 mm (0.3 in) of precipitation falls in August; it ranks 11th of the 12 months.
Is August the warmest month in Johannesburg?
No. The warmest month in Johannesburg is November, with an average high of 27 °C (80 °F). The coldest month is July, with an average low of 0 °C (33 °F).
How long is the day in Johannesburg in August?
In the middle of August the day in Johannesburg lasts about 11.2 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Johannesburg in August?
The average relative humidity in August is about 44%. This is a long-term average for the whole day.
How cloudy is Johannesburg in August?
On average about 24% of the sky is covered by cloud in August. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 1,538 m, while Johannesburg lies at about 1,767 m. Temperatures on this page were therefore adjusted by −1.5 °C2.7 °F using the standard lapse rate of 6.5 °C per 1,000 m.