Hermanus Weather in September
Hermanus in September sees pleasant temperatures, with highs around 18°C (64°F) and overnight lows of 11°C (52°F). Around 56 mm (2.2 in) of rainfall is typical, so a light rain jacket is a sensible addition to your bag.
Rainfall in Hermanus in September
Historically, approximately 10 days this month are expected to have rain, averaging 56 mm (2.2 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Hermanus in September
Daytime temperatures in Hermanus reach 18°C (64°F) in September, dropping to 11°C (52°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights drop to around 11°C (52°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.For Hermanus itself, January, February, March, April, May, October, November and December generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Hermanus Temperature in September
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Hermanus Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Hermanus - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Hermanus typically stay consistent throughout September, with daily highs averaging around 18°C (64°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 records for Hermanus in September
Browse day-by-day weather records for Hermanus spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Hermanus historical weather extremes in September
Based on 49 years of weather observations in Hermanus between 1976 and 2025, these are the recorded extremes.
- The warmest day in September was on September 12, 1997, with a maximum of 33°C (91°F).
- The coldest September day was on September 1, 1979, with a maximum of 11°C (52°F).
- The lowest overnight temperature recorded in September was 2°C (36°F) (September 1, 1990).
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 is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Hermanus in September
For Hermanus in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket.
What To Do in Hermanus in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling10/10 -
Walking10/10 -
Camping8/10 -
Outdoor sports10/10
Hermanus 3-Day Forecast
See the full Hermanus climate overview or explore weather in South Africa.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Whale watching at Hermanus
One of the best destinations in the world to spot whales is Hermanus in South Africa. Often the whales can be found off the coast between June and December. The peak is in September and November.
Visit Kruger Park in South Africa
Are you going to South Africa, then you cannot skip the Kruger Park. The Kruger Park is one of the most beautiful and largest safari parks in the world.
One of South Africa's most spectacular private game reserves
Sabi Sand Game Reserve is one of South Africa's most spectacular private game reserves. The chance that you see the entire Big Five is high in winter (June - August).
South Africa in November: Cape Town, Garden Route or East Coast?
Compare South Africa weather in November for Cape Town, Stellenbosch, Knysna, Durban and Johannesburg to find the driest and sunniest regions.