September weather forecast and climate
London, United Kingdom

The large Thames river in London overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom, on a cloudy evening after sunset
The large Thames river in London overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom, on a cloudy evening after sunset
September is the beginning of the wonderful autumn season in London as the average temperatures are in the range of 11.1°C (52°F) to 19.4°C (66.9°F) with many sunny days.
The average humidity is less during the autumn season compared to the rest of the year. Clouds gather in the skies at a quicker rate after the passage of summer.
The autumn brings cool breezes during the evenings that make the park visits enjoyable in London. The miles of biking tracks see many enthusiasts during the calm mornings and evenings.

What is the temperature in September in London?

The average high-temperature, in September, is 19.9°C (67.8°F), while the average low-temperature is 11.4°C (52.5°F).
Average temperature in September - London, United Kingdom
  • Average high temperature in September: 19.9°C

The warmest month (with the highest average high temperature) is July (23.5°C).
The month with the lowest average high temperature is January (8.1°C).

  • Average low temperature in September: 11.4°C

The month with the highest average low temperature is July (13.9°C).
The coldest month (with the lowest average low temperature) is February (2.1°C).

Average rainfall in September - London, United Kingdom
  • Average rainfall in September: 49.1mm

The wettest month (with the highest rainfall) is October (68.5mm).
The driest month (with the lowest rainfall) is February (40.9mm).

Average rainfall days in September - London, United Kingdom
  • Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is January (11.1 days).
The month with the lowest number of rainy days is August (7.5 days).

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 shortest days is December (Average daylight: 7.9h).

  • Average sunshine in September: 5h

Months with most sunshine are June and July (Average sunshine: 6.8h).
The month with least sunshine is December (Average sunshine: 1.7h).

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 6).
The month with the lowest UV index is December (UV index 0).

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