Johannesburg Weather in September
South Africa · Subtropical Highlands climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Johannesburg sees average temperatures ranging from a low of 10.0°C (50.0°F) to a high of 24.7°C (76.5°F), with a mean of 17.1°C (62.8°F). Compared to the annual average of 16.0°C (60.8°F), this month is 1.1°C warmer than the yearly norm. Precipitation averages 12.6mm, making it approximately 41.0mm drier than the monthly average of 54.0mm. The city receives an average of 11.2 hours of sunshine per day during September, with relative humidity averaging 40.2%. Wind speeds reach an average maximum of 21.3 km/h. For travelers, this month offers a temperature experience in Johannesburg, with drier-than-average conditions compared to the rest of the year.
Johannesburg's altitude of 1,753 meters creates a subtropical highland climate with comfortable temperatures and summer rainfall. I've studied the data and found that the city experiences mild, dry winters and warm, wet summers. The best time for visiting is May to September, when the weather is dry and the city's outdoor attractions are most accessible.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 12.9°C (55.2°F) | 17.1°C (62.8°F) | 18.4°C (65.1°F) |
| Rainfall | 3.0mm | 12.6mm | 44.7mm |
| Sunshine | 10.6 hrs | 11.2 hrs | 10.8 hrs |
| Humidity | 41.3% | 40.2% | 49.5% |
| Wind | 20.2 km/h | 21.3 km/h | 20.8 km/h |
| Rainy Days | 2.4 | 5.2 | 10.8 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Johannesburg in September, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Johannesburg in September?
The average temperature in Johannesburg during September ranges from 10.0°C (50.0°F) to 24.7°C (76.5°F), with a mean of 17.1°C (62.8°F).
How much does it rain in Johannesburg in September?
Johannesburg receives an average of 12.6mm of precipitation in September, spread across approximately 5.2 rainy days.
What should I pack for Johannesburg in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is September a good time to visit Johannesburg?
September is a good time to visit Johannesburg, with comfortable temperatures and manageable rainfall.
Other Months for Johannesburg
Cities with Similar September Climate (Subtropical Highlands)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: -26.2°, 28.05°. Timezone: Africa/Johannesburg. Last updated: 2026-07-30.