Knysna weather in September 2026

Expect daytime maximum temperatures of 18°C in Knysna, 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 75 mm of rainfall in the month.

  • 18°C maximum daytime temperature in September in Knysna18
    18°C max day temperature
  • 7 hours of sunshine per day
  • 11 days with some rainfall in September in Knysna11
    11 days with some rainfall
  • 10°C minimum night-time temperature in September in Knysna10
    10°C min night temperature
  • 12 hours of daylight per day in September in Knysna12
    12 hours of daylight per day
  • No heat & humidity in September in Knysna0
    No heat & humidity
  • 75 mm monthly rainfall in September in Knysna75
    75 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Knysna6
    6 (High) UV index
  • 17°C sea temperature in September in Knysna17
    17°C sea temperature

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The September weather guide for South Africa (Knysna) 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 Knysna in September?

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

How sunny is it in Knysna in September?

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

How warm is the sea around Knysna in September?

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

Does it rain in Knysna in September?

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

Knysna September sunrise & sunset times

Browse the sunrise and sunset times for Knysna in September 2026. Select a month to view Knysna sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 06:46 18:10
Tuesday, 15th September 2026 06:27 18:19
Wednesday, 30th September 2026 06:06 18:30

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