Weather in December
Sea temperature
In Saint Helena Bay, South Africa, the average seawater temperature in December is 16.7°C (62.1°F).Note: For most, swimming in 16.7°C (62.1°F) is not a pleasant experience. As the temperature falls from 21°C (69.8°F) to 15°C (59°F), controlling one's breathing becomes more difficult.
Daylight
With an average of 14h and 18min of daylight, December has the longest days of the year.On the first day of December, sunrise is at 05:32 and sunset at 19:41. On the last day of the month, sunrise is at 05:43 and sunset at 19:59 SAST.
Frequently asked questions
How cold is the water in December in Saint Helena Bay?
In Saint Helena Bay, the average seawater temperature in December is 16.7°C (62.1°F). For swimming, a surface water temperature of 16.7°C (62.1°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).
When are the longest days in Saint Helena Bay?
December has the longest days of the year in Saint Helena Bay, South Africa, with an average of 14h and 18min of daylight.
How many hours of daylight does Saint Helena Bay have in December?
In December, the average day length is 14h and 16min.
When are sunrise and sunset in December in Saint Helena Bay?
In December, on the first day of the month, sunrise is at 05:32 and sunset at 19:41. On the last day of the month, in Saint Helena Bay, sunrise is at 05:43 and sunset at 19:59 SAST.
Average sea temperature in December
Saint Helena Bay, South Africa
- Average sea temperature in December: 16.7°C
The best months for swimming (with the highest average sea temperature) are January and March (17.3°C).
The coldest month (with the lowest average sea temperature) is July (14.4°C).
Average daylight in December
Saint Helena Bay, South Africa
- Average daylight in December: 14h and 2min
The month with the longest days is December (Average daylight: 14h and 18min).
The month with the shortest days is June (Average daylight: 10h and 0min).
Saint Helena Bay, South Africa
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