September weather forecast
Brighton, United Kingdom

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Brown sandy shores of Brighton Beach in the United Kingdom, with a background view of the city buildings
Brown sandy shores of Brighton Beach in the United Kingdom, with a background view of the city buildings

Weather in September

September marks the beginning of a transition as summer surrenders to the touch of autumn in Brighton. While the warmth of summer still lingers, temperatures begin to cool noticeably as the month progresses. The land slowly morphs with golden hues of fall, signaling the end of beach season. A slight increase in rainfall and cloud cover can be noticed across the town. Amidst the transitions, Brighton remains an appealing destination, offering a unique blend of summer memories and the natural spectacle of autumn.

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?

In Brighton, in September, the average high-temperature is 17.8°C (64°F), and the average low-temperature is 12.9°C (55.2°F).

What is the least humid month in Brighton?

The months with the lowest humidity are August and September, with an average relative humidity of 79%.

What is the average humidity in September in Brighton?

The average relative humidity in September in Brighton, United Kingdom, is 79%.

How many days does it rain in September in Brighton?

In Brighton, United Kingdom, in September, it is raining for 12.8 days, with typically 33mm (1.3") of accumulated precipitation.

When it does not snow in Brighton?

In Brighton, United Kingdom, snow does not fall in May through October.

When is the sea warmest in Brighton?

September is the month with the warmest seawater in Brighton, United Kingdom, with an average sea temperature of 17.3°C (63.1°F).

How cold is the water in September in Brighton?

In Brighton, United Kingdom, in September, the average water temperature is 17.3°C (63.1°F). For swimming, a surface water temperature of 17.3°C (63.1°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).

What is the average length of the day in September in Brighton?

In Brighton, the average day length in September is 12h and 37min.

When is the sunrise / sunset in September in Brighton?

In September, on the first day of the month, sunrise is at 6:15 am and sunset at 7:45 pm. On the last day of the month, in Brighton, United Kingdom, sunrise is at 7:00 am and sunset at 6:40 pm BST.

How long on average sun shines in September in Brighton?

In September, the average sunshine duration in Brighton, United Kingdom, is 8.3h.

What is the UV index reading in September in Brighton?

In Brighton, United Kingdom, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Brighton, United Kingdom

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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