Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
As Hermanus welcomes December, the average high-temperature is noted at a pleasant 21.5°C (70.7°F), closely aligning with the preceding month. Nighttime temperatures in Hermanus during December report a consistent average of 17°C (62.6°F).Humidity
The average relative humidity in December is 75%.Rainfall
The months with the least rainfall in Hermanus are February and December Rain falls for 9.9 days and accumulates 13mm (0.51") of rain.Sea temperature
In Hermanus, South Africa, in December, the average water temperature is 19.3°C (66.7°F).Note: For swimming, a surface water temperature of 19.3°C (66.7°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
With an average of 14h and 24min of daylight, December has the longest days of the year.On the first day of the month, sunrise is at 05:23 and sunset at 19:40. On the last day of December, sunrise is at 05:33 and sunset at 19:58 SAST.
Sunshine
The month with the most sunshine in Hermanus is December, with an average of 10.4h of sunshine.UV index
The average daily maximum UV index in December in Hermanus is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: A maximum UV index of 5 in December translates into the following recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Frequently asked questions
What is the usual temperature for Hermanus in December?
What is the average humidity in December in Hermanus?
What is the driest month in Hermanus?
How many days does it rain in December in Hermanus?
How cold is the water in December in Hermanus?
When are the longest days in Hermanus?
What is the average length of the day in December in Hermanus?
When are sunrise and sunset in December in Hermanus?
What month has the most sunshine in Hermanus?
How long on average sun shines in December in Hermanus?
How high is the UV index in December in Hermanus?
Average temperature in December
Hermanus, South Africa
- Average high temperature in December: 21.5°C
The warmest month (with the highest average high temperature) is February (23.3°C).
The month with the lowest average high temperature is August (16.2°C).
- Average low temperature in December: 17°C
The month with the highest average low temperature is February (18.3°C).
The coldest month (with the lowest average low temperature) is August (11.5°C).
Average pressure in December
Hermanus, South Africa
- Average pressure in December: 1014.6mbar
The month with the highest atmospheric pressure is July (1021.8mbar).
The month with the lowest atmospheric pressure is February (1013.8mbar).
Average wind speed in December
Hermanus, South Africa
- Average wind speed in December: 21.1km/h
The windiest month (with the highest average wind speed) is November (21.5km/h).
The calmest month (with the lowest average wind speed) is May (17.7km/h).
Average humidity in December
Hermanus, South Africa
- Average humidity in December: 75%
The months with the highest relative humidity are January, February, March, May, September and October (76%).
The months with the lowest relative humidity are April, June and July (74%).
Average rainfall in December
Hermanus, South Africa
- Average rainfall in December: 13mm
The wettest month (with the highest rainfall) is June (47mm).
The driest months (with the least rainfall) are February and December (13mm).
Average rainfall days in December
Hermanus, South Africa
- Average rainfall days in December: 9.9 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is October (7.1 days).
Average sea temperature in December
Hermanus, South Africa
- Average sea temperature in December: 19.3°C
The best month for swimming (with the highest average sea temperature) is January (20°C).
The coldest month (with the lowest average sea temperature) is August (15.4°C).
Average daylight in December /
Average sunshine in December
Hermanus, South Africa
- Average daylight in December: 14h and 2min
The month with the longest days is December (Average daylight: 14h and 24min).
The month with the shortest days is June (Average daylight: 9h and 54min).
- Average sunshine in December: 10h and 2min
The month with the most sunshine is December (Average sunshine: 10h and 24min).
The month with the least sunshine is June (Average sunshine: 6h and 12min).
Average sunshine days in December
Hermanus, South Africa
- Average sunshine days in December: 16 days
The month with the most sunshine days is October (22 days).
The month with the least sunshine days is February (13.9 days).
Average UV index in December
Hermanus, South Africa
- Average UV index in December: 5
The months with the highest UV index are January and February (UV index 6).
The months with the lowest UV index are May, June, July, August and September (UV index 4).
Average cloud cover in December
Hermanus, South Africa
- Average cloud cover in December: 31
The months with the most cloud cover are March and October (Cloud cover 33).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in December
Hermanus, South Africa
- Average visibility in December: 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).
Hermanus, South Africa
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