Cape Town weather in September 2025

Expect daytime maximum temperatures of 18°C in Cape Town, South Africa in September based on long-term weather averages. There are 7 hours of sunshine per day on average with 11 days with some rainfall and typically 96 mm of rainfall in the month.

  • 18°C maximum daytime temperature in September in Cape Town18
    18°C max day temperature
  • 7 hours of sunshine per day
  • 11 days with some rainfall in September in Cape Town11
    11 days with some rainfall
  • 9°C minimum night-time temperature in September in Cape Town9
    9°C min night temperature
  • 12 hours of daylight per day in September in Cape Town12
    12 hours of daylight per day
  • No heat & humidity in September in Cape Town0
    No heat & humidity
  • 96 mm monthly rainfall in September in Cape Town96
    96 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Cape Town6
    6 (High) UV index
  • 15°C sea temperature in September in Cape Town15
    15°C sea temperature

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The September weather guide for South Africa (Cape Town) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about South Africa

How hot is it in Cape Town in September?

Daytime temperatures usually reach 18°C in Cape Town in September, falling to 9°C at night.

How sunny is it in Cape Town in September?

There are normally 7 hours of bright sunshine each day in Cape Town in September - that's 62% of daylight hours.

How warm is the sea around Cape Town in September?

The average sea temperature around Cape Town in September is 15°C.

Does it rain in Cape Town in September?

There are usually 11 days with some rain in Cape Town in September and the average monthly rainfall is 96mm.

Cape Town September sunrise & sunset times

Browse the sunrise and sunset times for Cape Town in September 2025. Select a month to view Cape Town sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 07:04 18:28
Monday, 15th September 2025 06:45 18:38
Tuesday, 30th September 2025 06:24 18:49

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