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
September's beginning signals an average high-temperature of a still enjoyable 17.8°C (64°F), barely different from August's 19.7°C (67.5°F). Brighton encounters an average temperature dip to a cool 12.9°C (55.2°F) throughout September, subtly lower than its daytime maximum.Humidity
The months with the lowest humidity are August and September, with an average relative humidity of 79%.Rainfall
In Brighton, in September, during 12.8 rainfall days, 33mm (1.3") of precipitation is typically accumulated. Throughout the year, there are 183 rainfall days, and 470mm (18.5") of precipitation is accumulated.Snowfall
May through October are months without snowfall.Sea temperature
September is the month with the warmest seawater in Brighton, United Kingdom, with an average sea temperature of 17.3°C (63.1°F).Note: Swimming in 17.3°C (63.1°F) is not pleasurable for most people. Breathing control grows increasingly challenging as the water temperature falls under 21°C (69.8°F).
Daylight
The average length of the day in September in Brighton is 12h and 37min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:40 pm BST.
Sunshine
The average sunshine in September in Brighton, United Kingdom, is 8.3h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Exercise prevention - Warding off sunburn is urged. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Frequently asked questions
What is the average September temperature in Brighton?
What is the least humid month in Brighton?
What is the average humidity in September in Brighton?
How many days does it rain in September in Brighton?
When it does not snow in Brighton?
When is the sea warmest in Brighton?
How cold is the water in September in Brighton?
What is the average length of the day in September in Brighton?
When is the sunrise / sunset in September in Brighton?
How long on average sun shines in September in Brighton?
What is the UV index reading in September in Brighton?
Average temperature in September
Brighton, United Kingdom
- Average high temperature in September: 17.8°C
The warmest month (with the highest average high temperature) is August (19.7°C).
The months with the lowest average high temperature are January and February (7.5°C).
- Average low temperature in September: 12.9°C
The month with the highest average low temperature is August (14.5°C).
The coldest month (with the lowest average low temperature) is February (4.2°C).
Average pressure in September
Brighton, United Kingdom
- Average pressure in September: 1017.3mbar
The month with the highest atmospheric pressure is September (1017.3mbar).
The month with the lowest atmospheric pressure is November (1011mbar).
Average wind speed in September
Brighton, United Kingdom
- Average wind speed in September: 18.1km/h
The windiest month (with the highest average wind speed) is December (24.6km/h).
The calmest month (with the lowest average wind speed) is July (16.8km/h).
Average humidity in September
Brighton, United Kingdom
- Average humidity in September: 79%
The months with the highest relative humidity are January and December (85%).
The months with the lowest relative humidity are August and September (79%).
Average rainfall in September
Brighton, United Kingdom
- Average rainfall in September: 33mm
The wettest months (with the highest rainfall) are November and December (59mm).
The driest month (with the least rainfall) is April (23mm).
Average rainfall days in September
Brighton, United Kingdom
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is November (18.5 days).
The month with the least rainy days is September (12.8 days).
Average snowfall in September
Brighton, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (8mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Brighton, United Kingdom
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (1.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Brighton, 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 (8.3°C).
Average daylight in September /
Average sunshine in September
Brighton, 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: 8h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in September
Brighton, United Kingdom
- Average sunshine days in September: 14.1 days
The month with the most sunshine days is September (14.1 days).
The month with the least sunshine days is November (8.2 days).
Average UV index in September
Brighton, 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
Brighton, United Kingdom
- Average cloud cover in September: 41
The month with the most cloud cover is February (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 40).
Average visibility in September
Brighton, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (10km).
The months with the lowest visibility are January and December (9km).
Brighton, United Kingdom
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