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 snowfall in September
- Average snowfall days 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
September
Weather in September
Temperature
The transition from August to September brings an average high-temperature of an enjoyable 18.2°C (64.8°F), barely different from August's 15.5°C (59.9°F). Throughout the nights in September, an average low-temperature of 7.7°C (45.9°F) is noted.Humidity
The average relative humidity in September in Swellendam is 59%.Rainfall
In September, the rain falls for 5.6 days. Throughout September, 11mm (0.43") of precipitation is accumulated. In Swellendam, during the entire year, the rain falls for 74.6 days and collects up to 147mm (5.79") of precipitation.Snowfall
January through June, September through December are months without snowfall in Swellendam.Daylight
In Swellendam, South Africa, the average length of the day in September is 11h and 53min.On the first day of September, sunrise is at 06:55 and sunset at 18:20. On the last day of the month, sunrise is at 06:15 and sunset at 18:40 SAST.
Sunshine
In September, the average sunshine in Swellendam is 9.2h.UV index
In Swellendam, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Swellendam in September?
What is the average humidity in September in Swellendam?
How many days does it rain in September in Swellendam?
When it does not snow in Swellendam?
Does it snow in Swellendam in September?
How many hours of daylight does Swellendam have in September?
When is the sunrise / sunset in September in Swellendam?
How long on average sun shines in September in Swellendam?
What is the UV index reading in September in Swellendam?
Average temperature in September
Swellendam, South Africa
- Average high temperature in September: 18.2°C
The warmest month (with the highest average high temperature) is January (28.3°C).
The month with the lowest average high temperature is June (14°C).
- Average low temperature in September: 7.7°C
The month with the highest average low temperature is February (16.1°C).
The coldest month (with the lowest average low temperature) is July (5.6°C).
Average pressure in September
Swellendam, South Africa
- Average pressure in September: 1019.2mbar
The month with the highest atmospheric pressure is July (1022.4mbar).
The month with the lowest atmospheric pressure is January (1012.9mbar).
Average wind speed in September
Swellendam, South Africa
- Average wind speed in September: 11.6km/h
The windiest month (with the highest average wind speed) is November (13.1km/h).
The calmest month (with the lowest average wind speed) is May (10.7km/h).
Average humidity in September
Swellendam, South Africa
- Average humidity in September: 59%
The month with the highest relative humidity is June (64%).
The months with the lowest relative humidity are February and November (53%).
Average rainfall in September
Swellendam, South Africa
- Average rainfall in September: 11mm
The wettest month (with the highest rainfall) is June (22mm).
The driest months (with the least rainfall) are February, April, October and December (9mm).
Average rainfall days in September
Swellendam, South Africa
- Average rainfall days in September: 5.6 days
The month with the highest number of rainy days is April (7.5 days).
The month with the least rainy days is November (5 days).
Average snowfall in September
Swellendam, South Africa
- Average snowfall in September: 0mm
The month with the highest snowfall is August (3mm).
The months with the least snowfall are January, February, March, April, May, June, September, October, November and December (0mm).
Average snowfall days in September
Swellendam, South Africa
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is August (0.3 days).
The months with the least snowfall days are January, February, March, April, May, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Swellendam, 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: 9h and 1min
The month with the most sunshine is December (Average sunshine: 11h and 42min).
The month with the least sunshine is June (Average sunshine: 6h and 36min).
Average sunshine days in September
Swellendam, South Africa
- Average sunshine days in September: 21.9 days
The month with the most sunshine days is May (24.1 days).
The month with the least sunshine days is February (19.8 days).
Average UV index in September
Swellendam, South Africa
- Average UV index in September: 4
The months with the highest UV index are January, February and December (UV index 6).
The month with the lowest UV index is June (UV index 3).
Average cloud cover in September
Swellendam, South Africa
- Average cloud cover in September: 22
The month with the most cloud cover is June (Cloud cover 27).
The month with the least cloud cover is February (Cloud cover 14).
Average visibility in September
Swellendam, 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).
