December weather forecast and climate
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 December

The first month of the summer, December, is a warm month in Cape Town, South Africa, with temperature in the range of an average low of 16.3°C (61.3°F) and an average high of 24.3°C (75.7°F).

Temperature

In Cape Town, the average high-temperature is essentially the same as in November - a warm 24.3°C (75.7°F). The average low-temperature, in December, is 16.3°C (61.3°F).

Humidity

Months with the lowest humidity are February, April and December, with an average relative humidity of 68%.

Rainfall

In Cape Town, during December, the rain falls for 6.4 days and regularly aggregates up to 16mm (0.63") of precipitation. Throughout the year, there are 111 rainfall days, and 435mm (17.13") of precipitation is accumulated.

Sea temperature

In Cape Town, the average seawater temperature is 18.1°C (64.6°F).
Note: For most, swimming in 18.1°C (64.6°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

With an average of 14.4h of daylight, December has the longest days of the year.

Sunshine

The month with the most sunshine is December, with an average of 11.1h of sunshine.

UV index

January, February and December, with an average maximum UV index of 6, are months with the highest UV index in Cape Town. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 6 in December interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in December in Cape Town?

In Cape Town, in December, the average high-temperature is 24.3°C (75.7°F), and the average low-temperature is 16.3°C (61.3°F).

What are the least humid months in Cape Town?

Months with the lowest humidity in Cape Town are February, April and December, with an average relative humidity of 68%.

What is the average humidity in December in Cape Town?

In Cape Town, the average relative humidity in December is 68%.

How much does it rain in Cape Town in December?

In Cape Town, in December, during 6.4 rainfall days, 16mm (0.63") of precipitation is typically accumulated.

What is the sea water temperature in December in Cape Town?

In December, the average sea temperature is 18.1°C (64.6°F). Swimming in 18.1°C (64.6°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

When are the longest days in Cape Town?

The month with the longest days is December, with an average of 14.4h of daylight.

How many hours of daylight does Cape Town have in December?

In Cape Town, South Africa, the average length of the day in December is 14.4h.

What month has the most sunshine in Cape Town?

The month with the most sunshine in Cape Town, South Africa, is December, with an average of 11.1h of sunshine.

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

In Cape Town, South Africa, the average sunshine in December is 11.1h.

What are the months with the highest UV index in Cape Town?

January, February and December, with an average maximum UV index of 6, are months with the highest UV index.

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

In December, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Cape Town, South Africa

Average temperature in December - Cape Town, South Africa
  • Average high temperature in December: 24.3°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 December: 16.3°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 December
Cape Town, South Africa

Average pressure in December - Cape Town, South Africa
  • Average pressure in December: 1014.3mbar

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 December
Cape Town, South Africa

Average wind speed in December - Cape Town, South Africa
  • Average wind speed in December: 17.3km/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 December
Cape Town, South Africa

Average humidity in December - Cape Town, South Africa
  • Average humidity in December: 68%

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

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Average rainfall in December
Cape Town, South Africa

Average rainfall in December - Cape Town, South Africa
  • Average rainfall in December: 16mm

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 December
Cape Town, South Africa

Average rainfall days in December - Cape Town, South Africa
  • Average rainfall days in December: 6.4 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 December
Cape Town, South Africa

Average sea temperature in December - Cape Town, South Africa
  • Average sea temperature in December: 18.1°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 December /
Average sunshine in December
Cape Town, South Africa

Average daylight in December / Average sunshine in December - Cape Town, South Africa
  • Average daylight in December: 14.4h

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

  • Average sunshine in December: 11.1h

The month with the most sunshine is December (Average sunshine: 11.1h).
The month with the least sunshine is June (Average sunshine: 6h).

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Average sunshine days in December
Cape Town, South Africa

Average sunshine days in December - Cape Town, South Africa
  • Average sunshine days in December: 22.6 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 December
Cape Town, South Africa

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

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

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Average cloud cover in December
Cape Town, South Africa

Average cloud cover in December - Cape Town, South Africa
  • Average cloud cover in December: 19

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 December
Cape Town, South Africa

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

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

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