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 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
The unfolding of September shows an average high-temperature of a comfortable 18.3°C (64.9°F), indicating a slight variance from August's 20.3°C (68.5°F). An average nighttime temperature of 11.5°C (52.7°F) is recorded in Southampton during September.Humidity
The average relative humidity in September in Southampton is 80%.Rainfall
In Southampton, in September, during 12.3 rainfall days, 28mm (1.1") of precipitation is typically accumulated. In Southampton, United Kingdom, during the entire year, the rain falls for 184.9 days and collects up to 482mm (18.98") of precipitation.Snowfall
In Southampton, snow does not fall in April through October.Sea temperature
With an average sea temperature of 17.3°C (63.1°F), September is the month with the warmest seawater.Note: Most people find swimming in 17.3°C (63.1°F) to be not enjoyable. The control of one's breathing becomes more challenging as the water temperature drops below 21°C (69.8°F).
Daylight
The average length of the day in September is 12h and 38min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:50 pm. On the last day of September, in Southampton, sunrise is at 7:05 am and sunset at 6:45 pm BST.
Sunshine
In Southampton, the average sunshine in September is 7.9h.UV index
In Southampton, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The UV index of 4 during September translates into the following guidance:
Guard yourself - Precautionary measures against sun damage are advocated. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Southampton?
What is the average humidity in September in Southampton?
How much does it rain in Southampton in September?
When it does not snow in Southampton?
What is the month with the warmest sea water in Southampton?
What is the sea temperature in September in Southampton?
How many hours of daylight does Southampton have in September?
When is the sunrise / sunset in September in Southampton?
How long on average sun shines in September in Southampton?
What is the UV index reading in September in Southampton?
Average temperature in September
Southampton, United Kingdom
- Average high temperature in September: 18.3°C
The warmest month (with the highest average high temperature) is July (20.7°C).
The month with the lowest average high temperature is January (7.4°C).
- Average low temperature in September: 11.5°C
The month with the highest average low temperature is August (13.3°C).
The coldest months (with the lowest average low temperature) are January and February (3.3°C).
Average pressure in September
Southampton, United Kingdom
- Average pressure in September: 1017.2mbar
The month with the highest atmospheric pressure is September (1017.2mbar).
The month with the lowest atmospheric pressure is November (1010.7mbar).
Average wind speed in September
Southampton, United Kingdom
- Average wind speed in September: 15km/h
The windiest month (with the highest average wind speed) is February (19.3km/h).
The calmest month (with the lowest average wind speed) is July (14km/h).
Average humidity in September
Southampton, United Kingdom
- Average humidity in September: 80%
The months with the highest relative humidity are January and December (87%).
The months with the lowest relative humidity are July and August (79%).
Average rainfall in September
Southampton, United Kingdom
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is December (61mm).
The driest month (with the least rainfall) is April (27mm).
Average rainfall days in September
Southampton, United Kingdom
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is November (17.5 days).
The month with the least rainy days is September (12.3 days).
Average snowfall in September
Southampton, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is December (8mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Southampton, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Southampton, United Kingdom
- Average sea temperature in September: 17.3°C
The best month for swimming (with the highest average sea temperature) is September (17.3°C).
The coldest month (with the lowest average sea temperature) is March (8.6°C).
Average daylight in September /
Average sunshine in September
Southampton, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is July (Average sunshine: 8h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in September
Southampton, United Kingdom
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is March (14 days).
The month with the least sunshine days is November (8.9 days).
Average UV index in September
Southampton, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February and November (UV index 2).
Average cloud cover in September
Southampton, United Kingdom
- Average cloud cover in September: 44
The month with the most cloud cover is November (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 44).
Average visibility in September
Southampton, United Kingdom
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Southampton, United Kingdom
Weather forecast for your location
2. Allow the app to use your location