September weather forecast and climate
London, United Kingdom

The large Thames river overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom
The large Thames river overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom

Weather in September

September, the first month of the autumn, in London, is also an enjoyable month, with average temperature varying between 11.3°C (52.3°F) and 19°C (66.2°F).

Temperature

In London, United Kingdom, the average high-temperature is almost the same as in August - a comfortable 19°C (66.2°F). In London, the average low-temperature is 11.3°C (52.3°F).

Humidity

In London, the average relative humidity in September is 76%.

Rainfall

In September, the rain falls for 9.8 days. Throughout September, 26mm (1.02") of precipitation is accumulated. Throughout the year, there are 151.7 rainfall days, and 370mm (14.57") of precipitation is accumulated.

Snowfall

In London snow does not fall in May through October.

Daylight

In September, the average length of the day is 12.6h.

Sunshine

In September, the average sunshine is 7.1h.

UV index

The average daily maximum UV index in London is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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 is the average humidity in September in London?

In September, the average relative humidity in London is 76%.

How many days does it rain in September in London?

In September, in London, United Kingdom, the rain falls for 9.8 days. Throughout September, 26mm (1.02") of precipitation is accumulated.

When it does not snow in London?

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

How many hours of daylight does London have in September?

In London, United Kingdom, the average length of the day in September is 12.6h.

How many hours of sunshine does London have in September?

In September, the average sunshine in London, United Kingdom, is 7.1h.

How high is the UV index in September in London?

In London, United Kingdom, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
London, United Kingdom

Average temperature in September - London, United Kingdom
  • Average high temperature in September: 19°C

The warmest month (with the highest average high temperature) is July (22.3°C).
The month with the lowest average high temperature is January (6.8°C).

  • Average low temperature in September: 11.3°C

The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is January (2.2°C).

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Average pressure in September
London, United Kingdom

Average pressure in September - London, United Kingdom
  • Average pressure in September: 1016.9mbar

The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).

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Average wind speed in September
London, United Kingdom

Average wind speed in September - London, United Kingdom
  • Average wind speed in September: 12.6km/h

The windiest month (with the highest average wind speed) is February (17.3km/h).
The calmest month (with the lowest average wind speed) is September (12.6km/h).

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Average humidity in September
London, United Kingdom

Average humidity in September - London, United Kingdom
  • Average humidity in September: 76%

The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is August (72%).

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Average rainfall in September
London, United Kingdom

Average rainfall in September - London, United Kingdom
  • Average rainfall in September: 26mm

The wettest month (with the highest rainfall) is June (45mm).
The driest month (with the least rainfall) is April (22mm).

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Average rainfall days in September
London, United Kingdom

Average rainfall days in September - London, United Kingdom
  • Average rainfall days in September: 9.8 days

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is September (9.8 days).

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Average snowfall in September
London, United Kingdom

Average snowfall in September - London, United Kingdom
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (16mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in September
London, United Kingdom

Average snowfall days in September - London, United Kingdom
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.5 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
London, United Kingdom

Average daylight in September / Average sunshine in September - London, United Kingdom
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16.5h).
The month with the shortest days is December (Average daylight: 7.9h).

  • Average sunshine in September: 7.1h

The month with the most sunshine is August (Average sunshine: 7.9h).
The month with the least sunshine is February (Average sunshine: 3.6h).

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Average sunshine days in September
London, United Kingdom

Average sunshine days in September - London, United Kingdom
  • Average sunshine days in September: 18.1 days

The month with the most sunshine days is September (18.1 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in September
London, United Kingdom

Average UV index in September - London, United Kingdom
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
London, United Kingdom

Average cloud cover in September - London, United Kingdom
  • Average cloud cover in September: 49

The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 49).

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Average visibility in September
London, United Kingdom

Average visibility in September - London, United Kingdom
  • Average visibility in September: 8km

Months with the highest visibility are January, February, March, April, May, June, July, August, October and December (9km).
Months with the lowest visibility are September and November (8km).

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