September weather forecast
Cape Town, South Africa

Cape Town, South Africa, with the surrounding calm clear waters and several mountains
Cape Town, South Africa, with the surrounding calm clear waters and several mountains

Weather in September

September, the first month of the spring in Cape Town, is still a comfortable month, with temperature in the range of an average high of 18°C (64.4°F) and an average low of 10.9°C (51.6°F).

Temperature

In September, the average high-temperature is essentially the same as in August - a still comfortable 18°C (64.4°F). In September, in Cape Town, the average low-temperature is 10.9°C (51.6°F).

Humidity

The months with the highest humidity are June, August and September, with an average relative humidity of 74%.

Rainfall

In Cape Town, during September, the rain falls for 11.7 days and regularly aggregates up to 37mm (1.46") of precipitation. In Cape Town, during the entire year, the rain falls for 111 days and collects up to 435mm (17.13") of precipitation.

Sea temperature

July through September, with an average sea temperature of 15.3°C (59.5°F), are months with the coldest seawater.
Note: Swimming in 15.3°C (59.5°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

Daylight

The average length of the day in September is 11h and 53min.
On the first day of the month, sunrise is at 07:04 and sunset at 18:28. On the last day of September, in Cape Town, sunrise is at 06:24 and sunset at 18:48 SAST.

Sunshine

In Cape Town, South Africa, the average sunshine in September is 8h.

UV index

The months with the lowest UV index are May through September, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Cape Town?

The average high-temperature, in September, in Cape Town, is 18°C (64.4°F), while the average low-temperature is 10.9°C (51.6°F).

What are the most humid months in Cape Town?

June, August and September, with an average relative humidity of 74%, are most humid months.

What is the average humidity in September in Cape Town?

The average relative humidity in September is 74%.

How much does it rain in Cape Town in September?

In Cape Town, South Africa, in September, during 11.7 rainfall days, 37mm (1.46") of precipitation is typically accumulated.

What are the months with the coldest sea water in Cape Town?

The months with the coldest seawater in Cape Town, South Africa, are July through September, with an average sea temperature of 15.3°C (59.5°F).

How cold is the water in September in Cape Town?

In Cape Town, the average seawater temperature in September is 15.3°C (59.5°F). Swimming in 15.3°C (59.5°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the average length of the day in September in Cape Town?

The average day length in September is 11h and 53min.

What time are sunrise and sunset in September in Cape Town?

In September, on the first day of the month, sunrise is at 07:04 and sunset at 18:28. On the last day of the month, in Cape Town, sunrise is at 06:24 and sunset at 18:48 SAST.

How many hours of sunshine does Cape Town have in September?

The average sunshine duration in September is 8h.

When is the lowest UV index in Cape Town?

May through September, with an average maximum UV index of 4, are months with the lowest UV index in Cape Town.

What is the UV index intensity in September in Cape Town?

In September, the average daily maximum UV index in Cape Town, South Africa, is 4. A UV Index reading of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.

Average temperature in September
Cape Town, South Africa

Average temperature in September - Cape Town, South Africa
  • Average high temperature in September: 18°C

The warmest month (with the highest average high temperature) is February (26.1°C).
The month with the lowest average high temperature is August (16.6°C).

  • Average low temperature in September: 10.9°C

The month with the highest average low temperature is January (17.7°C).
The coldest months (with the lowest average low temperature) are July and August (10.2°C).

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Average pressure in September
Cape Town, South Africa

Average pressure in September - Cape Town, South Africa
  • Average pressure in September: 1019.6mbar

The month with the highest atmospheric pressure is July (1022mbar).
The month with the lowest atmospheric pressure is February (1013.4mbar).

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Average wind speed in September
Cape Town, South Africa

Average wind speed in September - Cape Town, South Africa
  • Average wind speed in September: 15km/h

The windiest month (with the highest average wind speed) is January (17.6km/h).
The calmest month (with the lowest average wind speed) is May (13.4km/h).

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Average humidity in September
Cape Town, South Africa

Average humidity in September - Cape Town, South Africa
  • Average humidity in September: 74%

The months with the highest relative humidity are June, August and September (74%).
The months with the lowest relative humidity are February, April and December (68%).

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Average rainfall in September
Cape Town, South Africa

Average rainfall in September - Cape Town, South Africa
  • Average rainfall in September: 37mm

The wettest month (with the highest rainfall) is June (98mm).
The driest month (with the least rainfall) is February (7mm).

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Average rainfall days in September
Cape Town, South Africa

Average rainfall days in September - Cape Town, South Africa
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is June (13.8 days).
The month with the least rainy days is February (4.9 days).

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Average sea temperature in September
Cape Town, South Africa

Average sea temperature in September - Cape Town, South Africa
  • Average sea temperature in September: 15.3°C

The best month for swimming (with the highest average sea temperature) is January (18.5°C).
The coldest months (with the lowest average sea temperature) are July, August and September (15.3°C).

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Average daylight in September /
Average sunshine in September
Cape Town, South Africa

Average daylight in September / Average sunshine in September - Cape Town, South Africa
  • Average daylight in September: 11h and 53min

The month with the longest days is December (Average daylight: 14h and 22min).
The month with the shortest days is June (Average daylight: 9h and 56min).

  • Average sunshine in September: 8h and 0min

The month with the most sunshine is December (Average sunshine: 11h and 6min).
The month with the least sunshine is June (Average sunshine: 6h and 0min).

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Average sunshine days in September
Cape Town, South Africa

Average sunshine days in September - Cape Town, South Africa
  • Average sunshine days in September: 16 days

The month with the most sunshine days is January (23.1 days).
The month with the least sunshine days is June (14.6 days).

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Average UV index in September
Cape Town, South Africa

Average UV index in September - Cape Town, South Africa
  • Average UV index in September: 4

The months with the highest UV index are January, February and December (UV index 6).
The months with the lowest UV index are May, June, July, August and September (UV index 4).

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Average cloud cover in September
Cape Town, South Africa

Average cloud cover in September - Cape Town, South Africa
  • Average cloud cover in September: 33

The month with the most cloud cover is June (Cloud cover 34).
The month with the least cloud cover is February (Cloud cover 15).

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Average visibility in September
Cape Town, South Africa

Average visibility in September - Cape Town, South Africa
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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