Cape Town weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: September – May
What is the weather like in Cape Town in September?
In September, Cape Town is mild: daytime highs average 18 °C, and nights cool down to about 10 °C. The sea averages 14.8 °C – swimming is only for the hardy. The sun shines for around 8 hours a day. Rain falls on about 7 days, adding up to 40 mm. All in all, September is an excellent month for a holiday in Cape Town.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 74 | 91 | 99 |
| Day | 17° | 18° | 21° |
| Night | 9° | 10° | 12° |
| Sea | 15° | 15° | 15° |
| Sun | 7 h | 8 h | 10 h |
| Rain days | 10 | 7 | 5 |
More details for September
- Daylight
- 11 h 50 min06:47 – 18:37
- UV index
- 7 · highclear sky, noon (estimate)
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 21 km/haverage daily peak
- Cloud cover
- 47 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+2Africa/Johannesburg
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %88 %
- Few rainy daysweight 30 %79 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
Cape Town in September: quick answers
Is Cape Town hot in September?
No. In September, Cape Town is mild: daytime highs average 18 °C and nights drop to about 10 °C.
Can you swim in Cape Town in September?
Only if you don't mind cold water: in September the sea averages just 14.8 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Cape Town in September?
Rain falls on about 7 days, adding up to 40 mm.
Cape Town month by month
The whole year in Cape TownAll destinations: South Africa
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)