Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With the start of September, Hermanus measures an average high-temperature of a still refreshing 17.3°C (63.1°F), not significantly differing from August's 16.2°C (61.2°F). Throughout September, a steady low-temperature average of 12.2°C (54°F) is noted.Humidity
The months with the highest humidity in Hermanus are January through March, May, September and October, with an average relative humidity of 76%.Rainfall
In Hermanus, in September, during 7.5 rainfall days, 15mm (0.59") of precipitation is typically accumulated. Throughout the year, in Hermanus, South Africa, there are 113.9 rainfall days, and 270mm (10.63") of precipitation is accumulated.Sea temperature
In September, the average sea temperature in Hermanus is 15.7°C (60.3°F).Note: Swimming in 15.7°C (60.3°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).
Daylight
In Hermanus, the average length of the day in September is 11h and 53min.On the first day of the month, sunrise is at 07:00 and sunset at 18:24. On the last day of September, in Hermanus, South Africa, sunrise is at 06:20 and sunset at 18:45 SAST.
Sunshine
The average sunshine in September in Hermanus is 8.2h.UV index
May through September, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. To avoid the Sun's strongest rays, limit exposure around the mid-day period. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Frequently asked questions
What is the usual temperature for Hermanus in September?
What are the most humid months in Hermanus?
What is the average humidity in September in Hermanus?
How many days does it rain in September in Hermanus?
What is the sea temperature in September in Hermanus?
What is the average length of the day in September in Hermanus?
What time are sunrise and sunset in September in Hermanus?
How long on average sun shines in September in Hermanus?
What are the months with the lowest UV index in Hermanus?
What is the UV index reading in September in Hermanus?
Average temperature in September
Hermanus, South Africa
- Average high temperature in September: 17.3°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 September: 12.2°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 September
Hermanus, South Africa
- Average pressure in September: 1019.4mbar
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 September
Hermanus, South Africa
- Average wind speed in September: 20.3km/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 September
Hermanus, South Africa
- Average humidity in September: 76%
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 September
Hermanus, South Africa
- Average rainfall in September: 15mm
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 September
Hermanus, South Africa
- Average rainfall days in September: 7.5 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 September
Hermanus, South Africa
- Average sea temperature in September: 15.7°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 September /
Average sunshine in September
Hermanus, South Africa
- Average daylight in September: 11h and 5min
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 September: 8h and 1min
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 September
Hermanus, South Africa
- Average sunshine days in September: 20 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 September
Hermanus, South Africa
- Average UV index in September: 4
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 September
Hermanus, South Africa
- Average cloud cover in September: 32
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 September
Hermanus, South Africa
- Average visibility in September: 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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