Weather in Cape Town in September 2025
Average weather
Average temperature in Cape Town in September
Going from a maximum of +25°C during the day to a minimum of +6°C during the night, the temperature in September averages around +18°C.
The average maximum temperature goes up 11% by the end of the month, compared with the beginning of the month, from +16°C to +18°C.
Is Cape Town warm or cold in September?
Cape Town is typically mild in September.
Maximum temperatures go up compared to the previous month from +17°C to +18°C. The minimum temperature also goes up from +11°C to +12°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Cape Town:
Water temperature in Cape Town in September
Water in Cape Town in September is Cold. It varies from +15°C to +16°C, with an average of +15°C. This is almost similar to the air temperature, which averages +18°C.
The water temperature in September is one of the coldest of the entire year:
Can you swim in Cape Town in September?
Climate in Cape Town in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +17°C | +18°C | +19°C | ||||
| Min. temperature | ||||||
| +3°C | +4°C | 0°C | ||||
| Max. temperature | ||||||
| +28°C | +36°C | +33°C | ||||
| Rainfall | ||||||
| 77 mm | 46 mm | 25 mm | ||||
| Wind | ||||||
| 4 m/s | 5 m/s | 5 m/s | ||||
| Avg. water temperature | ||||||
| +15°C | +15°C | +16°C | ||||
| Humidity | ||||||
| 77% | 75% | 72% | ||||
| Air pressure | ||||||
| 1019 HPa | 1018 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 10 | 10 | 12 | ||||
| Cloudy days | ||||||
| 7 | 9 | 10 | ||||
| Rainy days | ||||||
| 13 | 12 | 8 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September often has better weather than August. It’s getting warmer as September arrives. The average maximum temperature goes up from +17°C to +18°C during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 77 mm to 46 mm. It feels drier, as humidity decreases from 77% to 75%. Winds are stronger in comparison to August, going up from 4 m/s to 5 m/s on average. The amount of sunny days stay about the same, averaging 10 sunny days during the month.
October brings much the same weather, it remains good.
Wind
The average wind speed is 5 m/s getting up to 10 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Cape Town is gradually increasing during September, going from 2 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Cape Town?
Climate Change over Years
The climate in Cape Town in September has not changed much over the last 43 years.
The average temperature was the lowest in 1996 (+18°C) and the highest in 2022 (+22°C). The driest year was 2017 with only 308 mm of rainfall, and the wettest year was 2023 with 1389 mm.
FAQ
Is September a good time to visit Cape Town?
Can you sunbathe in Cape Town in September?
Can you swim in Cape Town in September?
Is Cape Town rainy in September?
Is it sunny in Cape Town in September?
Other cities in South Africa
Monthly weather in Cape Town
Source of the data
For this page, we’ve looked at the typical weather in Cape Town, 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.