Knysna Weather in September
Knysna in September sees pleasant temperatures, with highs around 19°C (66°F) and overnight lows of 12°C (54°F). Around 55 mm (2.2 in) of rainfall is typical, so a light rain jacket is a sensible addition to your bag.
Rainfall in Knysna in September
Expect around 11 days of rain based on historical data, with 55 mm (2.2 in) average. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Knysna in September
If you're visiting Knysna in September, expect highs of 19°C (66°F) and overnight lows around 12°C (54°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows of 12°C (54°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Knysna in September
The days are predominantly sunny, with an estimated total of around 255 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Knysna. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Africa, check out our Knysna's climate page.
Knysna Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
19°C (66°F)
Chance of Rain
35%
Precipitation
55 mm (2.2 in)
Rainy days
11 days
Sunshine
255 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Knysna typically stay consistent throughout September, with daily highs averaging around 19°C (66°F). Nights are cool, with lows around 10°C (50°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Knysna in September
Browse day-by-day weather records for Knysna spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Knysna historical weather extremes in September
The extremes listed below come from historical weather data collected in Knysna from 1976 through 2025.
- The hottest September day on record in Knysna reached 33°C (91°F) (September 7, 2006).
- The coldest September day was on September 1, 1979, with a maximum of 9°C (48°F).
- Nighttime temperatures dropped to 1°C (34°F) on September 19, 2000, marking the coldest September night on record.
Best Places in South Africa in September
Find out more about the weather in South Africa and which places have the best travel conditions in this month. See all of South Africa in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Knysna in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Knysna in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Africa, check out our Knysna's climate page.
See the full Knysna climate overview or explore weather in South Africa.
