Cape Town Weather in September

Cape Town in September averages 18°C (64°F) during the day and 11°C (52°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Cape Town in September

Typically, you can expect about 10 days of rain this month, with 63 mm (2.5 in) on average. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Cape Town in September

Expect highs of 18°C (64°F) in Cape Town in September, with nights dropping to around 11°C (52°F). The difference between afternoon and evening temperatures is usually noticeable. At 11°C (52°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Cape Town in September

There are approximately 225 hours of sunshine this month, resulting in mostly clear days.

Wind Speed in Cape Town in September

September has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in September

With water at 15°C (59°F), it's on the cooler side. Keen swimmers won't be put off, but those who prefer warm water may find it less enjoyable.

For Cape Town 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.

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• January
• February
• March
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• May
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• October
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• December

For a detailed overview over the year and the best time to visit South Africa, check out our Cape Town's climate page.

Cape Town Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 18°C (64°F)  

Water Temperature 15°C (59°F)  

Chance of Rain 34%  

Precipitation 63 mm (2.5 in)  

Rainy days 10 days  

Humidity 77%  

Windspeed 5 m/s (10 knots)  

Sunshine 225 hours  

Percentage Sunshine  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Cape Town 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

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

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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

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

‹ January February March April May June July August September October November December ›

Historical weather for Cape Town in September

Browse day-by-day weather records for Cape Town spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Cape Town historical weather extremes in September

The extremes listed below come from historical weather data collected in Cape Town from 1976 through 2025.

• On September 13, 1997, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
• The lowest daytime temperature in September was 12°C (54°F), recorded on September 20, 2013.
• Nighttime temperatures dropped to 2°C (36°F) on September 1, 1990, marking the coldest September night on record.

What to Wear in Cape Town 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. The water temperature sits at about 15°C (59°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Cape Town in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

10/10

Walking

10/10

Camping

8/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit South Africa, check out our Cape Town's climate page.

More climate data for Cape Town

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Cape Town climate overview or explore weather in South Africa.