Weather in Johannesburg in September 2025
- September is usually the driest month of the year in Johannesburg
Average weather
Average temperature in Johannesburg in September
Going from a maximum of +30°C during the day to a minimum of +3°C during the night, the temperature in September averages around +25°C.
The average maximum temperature goes up 15% by the end of the month, compared with the beginning of the month, from +25°C to +29°C.
Is Johannesburg warm or cold in September?
Johannesburg is typically warm in September.
Maximum temperatures go up compared to the previous month from +20°C to +23°C. The minimum temperature also goes up from +5°C to +9°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Johannesburg:
Climate in Johannesburg in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +20°C | +23°C | +24°C | ||||
| Min. temperature | ||||||
| -5°C | -1°C | +3°C | ||||
| Max. temperature | ||||||
| +28°C | +32°C | +34°C | ||||
| Rainfall | ||||||
| 12 mm | 28 mm | 82 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 51% | 49% | 58% | ||||
| Air pressure | ||||||
| 1022 HPa | 1019 HPa | 1018 HPa | ||||
| Sunny days | ||||||
| 22 | 17 | 9 | ||||
| Cloudy days | ||||||
| 5 | 5 | 5 | ||||
| Rainy days | ||||||
| 4 | 7 | 17 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting warmer as September arrives. The average maximum temperature goes up from +20°C to +23°C during the day. Prepare for more rain. Average rainfall goes from 12 mm to 28 mm. It feels drier, as humidity decreases from 51% to 49%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 22 sunny days in August to 17 in September.
October brings much the same weather, it remains good.
Wind
The average wind speed is 2 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 increasing during September, going from 1 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Johannesburg?
Climate Change over Years
The climate in Johannesburg in September 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 September a good time to visit Johannesburg?
Can you sunbathe in Johannesburg in September?
Is Johannesburg rainy in September?
Is it sunny in Johannesburg in September?
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.