Weather in Johannesburg in August 2025
Average weather
Average temperature in Johannesburg in August
Going from a maximum of +27°C during the day to a minimum of -1°C during the night, the temperature in August averages around +21°C.
The average maximum temperature goes up 25% by the end of the month, compared with the beginning of the month, from +16°C to +23°C.
Is Johannesburg warm or cold in August?
Johannesburg is typically mild in August.
Maximum temperatures go up compared to the previous month from +17°C to +20°C. The minimum temperature also goes up from +3°C to +5°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how August is compared to other months in Johannesburg:
Climate in Johannesburg in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +17°C | +20°C | +23°C | ||||
| Min. temperature | ||||||
| -5°C | -5°C | -1°C | ||||
| Max. temperature | ||||||
| +25°C | +28°C | +32°C | ||||
| Rainfall | ||||||
| 5 mm | 12 mm | 28 mm | ||||
| Wind | ||||||
| 1 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 55% | 51% | 49% | ||||
| Air pressure | ||||||
| 1024 HPa | 1022 HPa | 1019 HPa | ||||
| Sunny days | ||||||
| 24 | 22 | 17 | ||||
| Cloudy days | ||||||
| 4 | 5 | 5 | ||||
| Rainy days | ||||||
| 2 | 4 | 7 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as great as in July. It’s getting warmer as August arrives. The average maximum temperature goes up from +17°C to +20°C during the day. Prepare for more rain. Average rainfall goes from 5 mm to 12 mm. It feels drier, as humidity decreases from 55% to 51%. Winds are stronger in comparison to July, going up from 1 m/s to 2 m/s on average. The days becoming less sunny, going from 24 sunny days in July to 22 in August.
Next month (September) brings a further decline in the weather.
Wind
The average wind speed is 1 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Johannesburg is gradually decreasing during August, going from 2 m/s to 1 m/s over the course of the month.
How was the weather last August in Johannesburg?
Climate Change over Years
The climate in Johannesburg in August has not changed much over the last 43 years.
The average temperature was the lowest in 2000 (+20°C) and the highest in 2015 (+25°C). The driest year was 2015 with only 464 mm of rainfall, and the wettest year was 2022 with 1539 mm.
FAQ
Is August a good time to visit Johannesburg?
Can you sunbathe in Johannesburg in August?
Is Johannesburg rainy in August?
Is it sunny in Johannesburg in August?
Other cities in South Africa
Monthly weather in Johannesburg
Source of the data
For this page, we’ve looked at the typical weather in Johannesburg, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.