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

December 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 summer, Diciembre, is still a warm month in Cape Town, South Africa, with temperature in the range of an average low of 14.9°C (58.8°F) and an average high of 24.9°C (76.8°F).

Temperature

In Diciembre, the average high-temperature is essentially the same as in Noviembre - a still warm 24.9°C (76.8°F). The average low-temperature, is 14.9°C (58.8°F).

Humidity

Months with the lowest humidity are Enero, Noviembre and Diciembre, with an average relative humidity of 71%.

Rainfall

In Cape Town, during Diciembre, the rain falls for 6.3 days and regularly aggregates up to 17mm (0.67") of precipitation. Throughout the year, there are 103.7 rainfall days, and 515mm (20.28") of precipitation is accumulated.

Sea temperature

In Diciembre, the average sea temperature in Cape Town 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, Diciembre has the longest days of the year in Cape Town.

Sunshine

In Diciembre, the average sunshine in Cape Town, South Africa, is 10.8h.

UV index

Months with the highest UV index are Enero and Diciembre, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an extreme threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In Diciembre, the average maximum UV index of 12 translate into the following recommendations:
Take all necessary precautions, as unprotected skin can burn in minutes. 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. A wide-brim hat offers excellent sun protection for 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.

What is the temperature in Diciembre in Cape Town?

In Diciembre, in Cape Town, South Africa, the average high-temperature is 24.9°C (76.8°F), and the average low-temperature is 14.9°C (58.8°F).

What is the least humid month in Cape Town?

Months with the lowest humidity are Enero, Noviembre and Diciembre, with an average relative humidity of 71%.

What is the average humidity in Diciembre in Cape Town?

In Cape Town, South Africa, the average relative humidity in Diciembre is 71%.

How much does it rain in Cape Town in Diciembre?

In Cape Town, South Africa, in Diciembre, during 6.3 rainfall days, 17mm (0.67") of precipitation is typically accumulated.

How cold is the water in Diciembre in Cape Town?

In Cape Town, in Diciembre, the average water 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?

Diciembre has the longest days of the year in Cape Town, with an average of 14.4h of daylight.

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

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

How long on average sun shines in Diciembre in Cape Town?

In Diciembre, the average sunshine is 10.8h.

When is the highest UV index in Cape Town?

Months with the highest UV index are Enero and Diciembre, with an average maximum UV index of 12.

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

In Diciembre, the average daily maximum UV index is 12. A UV Index reading of 11, and higher, represents an ultimate hazard to health from the exposure to the Sun's UV rays.
Average temperature in December - Cape Town, South Africa
  • Average high temperature in December: 24.9°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 December: 14.9°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 December - Cape Town, South Africa
  • Average humidity in December: 71%

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 December - Cape Town, South Africa
  • Average rainfall in December: 17mm

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

Average rainfall days in December - Cape Town, South Africa
  • Average rainfall days in December: 6.3 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 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).
Coldest months (with the lowest average sea temperature) are July, August and September (15.3°C).

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 shortest days is June (Average daylight: 9.9h).

  • Average sunshine in December: 10.8h

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 December - Cape Town, South Africa
  • Average UV index in December: 12

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).