September weather forecast
Brighton, United Kingdom

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

The first month of the autumn, September, is also an enjoyable month in Brighton, United Kingdom, with an average temperature fluctuating between 17.8°C (64°F) and 12.9°C (55.2°F).

Temperature

In September, the average high-temperature is almost the same as in August - a still comfortable 17.8°C (64°F). In Brighton, in September, the average low-temperature is 12.9°C (55.2°F).

Humidity

August and September, with an average relative humidity of 79%, are the least humid months in Brighton.

Rainfall

In Brighton, during September, the rain falls for 12.8 days and regularly aggregates up to 33mm (1.3") of precipitation. Throughout the year, in Brighton, there are 183 rainfall days, and 470mm (18.5") of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Brighton, United Kingdom.

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: 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).

Daylight

In Brighton, United Kingdom, the average length of the day in September is 12h and 37min.
On the first day of the month, sunrise is at 6:14 am and sunset at 7:46 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:41 pm BST.

Sunshine

In September, the average sunshine is 8.3h.

UV index

In Brighton, United Kingdom, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What are the least humid months in Brighton?

August and September, with an average relative humidity of 79%, are the least humid months in Brighton, United Kingdom.

What is the average humidity in September in Brighton?

The average relative humidity in September 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.

What is the month with the warmest sea water in Brighton?

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

What is the sea temperature in September in Brighton?

In Brighton, the average seawater temperature in September is 17.3°C (63.1°F). Swimming in 17.3°C (63.1°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Brighton have in September?

In September, the average day length in Brighton, United Kingdom, 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 6:14 am and sunset at 7:46 pm. On the last day of the month, in Brighton, United Kingdom, sunrise is at 6:59 am and sunset at 6:41 pm BST.

How many hours of sunshine does Brighton have in September?

The average sunshine duration in September is 8.3h.

What is the UV index intensity in September in Brighton?

In Brighton, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.

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).

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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).

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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).

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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%).

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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).

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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).

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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).

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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).

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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).

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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 37min

The month with the longest days is June (Average daylight: 16h and 26min).
The month with the shortest days is December (Average daylight: 8h and 2min).

  • Average sunshine in September: 8.3h

The month with the most sunshine is July (Average sunshine: 9.3h).
The month with the least sunshine is February (Average sunshine: 3.9h).

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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).

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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).

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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).

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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).

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