Knysna weather in September 2025

Expect 18°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Knysna in September. Check more long-term weather averages for Knysna in September before you book your next holiday to South Africa in 2025/2026.

  • 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

More about Knysna

Knysna by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for South Africa

TUI: up to 7% off holidays booked online

  • Book online with TUI & save up to 7% on holidays
  • FREE child places available for select holidays
  • Pay £0 deposits with direct debit & spread the cost
Go to TUI deal >>

View all TUI offers

TUITUI deal finder

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)

Back to top

More about South Africa

How hot is it in Knysna in September?

Daytime temperatures usually reach 18°C in Knysna in September, falling to 10°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 59% of daylight hours.

How warm is the sea around Knysna in September?

The average sea temperature around Knysna in September is 17°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 75mm.

Knysna September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:46 18:10
Monday, 15th September 2025 06:27 18:19
Tuesday, 30th September 2025 06:06 18:30

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^