Cape Town
South Africa
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Cape Town, South Africa

An aerial view of Cape Town, South Africa, with the surrounding calm clear waters and several mountains
An aerial view of Cape Town, South Africa, with the surrounding calm clear waters and several mountains
The first month of the spring, Septiembre, is still a comfortable month in Cape Town, South Africa, with average temperature ranging between min 8.7°C (47.7°F) and max 19.2°C (66.6°F).

Temperature

In Septiembre, the average high-temperature is almost the same as in Agosto - a still comfortable 19.2°C (66.6°F). The average low-temperature, in Cape Town, is 8.7°C (47.7°F).

Humidity

In Cape Town, South Africa, the average relative humidity in Septiembre is 77%.

Rainfall

In Cape Town, in Septiembre, during 10.4 rainfall days, 40mm (1.57") of precipitation is typically accumulated. In Cape Town, during the entire year, the rain falls for 103.7 days and collects up to 515mm (20.28") of precipitation.

Sea temperature

Julio through Septiembre, with an average sea temperature of 15.3°C (59.5°F), are months with the coldest seawater.
Note: For swimming, a surface water temperature of 15.3°C (59.5°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

In Cape Town, the average length of the day in Septiembre is 11.9h.

Sunshine

In Cape Town, the average sunshine is 7.5h.

UV index

In Septiembre, the average daily maximum UV index in Cape Town is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: In Septiembre, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in Septiembre in Cape Town?

The average high-temperature, in Septiembre, in Cape Town, South Africa, is 19.2°C (66.6°F), while the average low-temperature is 8.7°C (47.7°F).

What is the average humidity in Septiembre in Cape Town?

The average relative humidity in Septiembre in Cape Town is 77%.

How much does it rain in Cape Town in Septiembre?

In Cape Town, in Septiembre, during 10.4 rainfall days, 40mm (1.57") of precipitation is typically accumulated.

When is the sea coldest in Cape Town?

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

What is the sea temperature in Septiembre in Cape Town?

In Cape Town, the average seawater temperature in Septiembre 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 Septiembre in Cape Town?

In Septiembre, the average length of the day is 11.9h.

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

In Septiembre, the average sunshine in Cape Town is 7.5h.

What is the UV index reading in Septiembre in Cape Town?

In Septiembre, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays.
Average temperature in September - Cape Town, South Africa
  • Average high temperature in September: 19.2°C

The warmest month (with the highest average high temperature) is February (26.5°C).
The month with the lowest average high temperature is July (17.5°C).

  • Average low temperature in September: 8.7°C

The month with the highest average low temperature is January (15.7°C).
The coldest month (with the lowest average low temperature) is July (7°C).

Average humidity in September - Cape Town, South Africa
  • Average humidity in September: 77%

Months with the highest relative humidity are May, June and July (81%).
Months with the lowest relative humidity are January, November and December (71%).

Average rainfall in September - Cape Town, South Africa
  • Average rainfall in September: 40mm

The wettest month (with the highest rainfall) is June (93mm).
The driest month (with the lowest rainfall) is November (14mm).

Average rainfall days in September - Cape Town, South Africa
  • Average rainfall days in September: 10.4 days

The month with the highest number of rainy days is August (13.7 days).
The month with the lowest number of rainy days is February (4.6 days).

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).
Coldest months (with the lowest average sea temperature) are July, August and September (15.3°C).

Average daylight in September / Average sunshine in September - Cape Town, South Africa
  • Average daylight in September: 11.9h

The month with the longest days is December (Average daylight: 14.4h).
The month with shortest days is June (Average daylight: 9.9h).

  • Average sunshine in September: 7.5h

The month with most sunshine is January (Average sunshine: 10.9h).
The month with least sunshine is June (Average sunshine: 5.8h).

Average UV index in September - Cape Town, South Africa
  • Average UV index in September: 6

Months with the highest UV index are January and December (UV index 12).
Months with the lowest UV index are June and July (UV index 3).