Weather for London in September is typically good with an average maximum temperature of +19°C during the day, and approximately 4 sunny days monthly. Typically, there are about 14 rainy days with the total average precipitation that falls in September around 47 mm. Expect good weather and pack accordingly to enjoy the outdoors. Search flightsin one click on Avionero.
Average weather
☀️
+19°C
Avg. max. temperature
+3°C
Min.
+32°C
Max.
47 mm
Total precipitation
74%
Avg. humidity
3 m/s
Avg. wind
4 ☀️
Sunny Days
11 ⛅️
Cloudy
14 🌦
Rainy
Our opinion: London has good weather in September.
Average temperature in London in September
Here are the expected maximum, average and minimum temperatures in London for September based on the historical data.
Last Year
Historical Data
The expected average maximum temperature in September is +23°C with a maximum of +32°C and a minimum of +9°C.
The average maximum temperature goes down 9% by the end of the month, compared with the beginning of the month, from +22°C to +20°C.
Is London warm or cold in September?
London is typically mild in September.
Maximum temperatures go down compared to the previous month from +22°C to +19°C. The minimum temperature also goes down from +14°C to +12°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in London:
Climate in London in September
London weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+22°C
+19°C
+15°C
Min. temperature
+7°C
+3°C
-2°C
Max. temperature
+37°C
+32°C
+28°C
Rainfall
58 mm
47 mm
68 mm
Wind
3 m/s
3 m/s
3 m/s
Humidity
70%
74%
78%
Air pressure
1014 HPa
1015 HPa
1013 HPa
Sunny days
5
4
4
Cloudy days
9
11
11
Rainy days
16
14
16
Snowy days
0
0
0
September weather is still as good as in August.It’s getting colder in September. From +22°C in the day, the average maximum temperature lowers to +19°C.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 58 mm to 47 mm.Humidity rises from 70% to 74%.The average wind speed doesn’t change much during September, staying around 3 m/s.The days becoming less sunny, going from 5 sunny days in August to 4 in September.
Next month (October) brings a further decline in the weather.
Wind speed in London in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in London is gradually increasing during September, going from 2 m/s to 3 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in London based on historical data.
Last Year
Historical Data
Total precipitation in September is about 78 mm, with a 33% chance of rain on a typical day. The maximum amount of rainfall per day is around 29 mm, which is moderate rain.September is a pretty wet month with over 10 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
Here’s how September is compared with other months in the amount of precipitation, total mm:
London wettest month is October, where a typical day has a 52% chance of precipitation and 68 mm of rainfall per day. February, on the other hand, is the driest month with a mere 41% chance of precipitation and 41 mm of rainfall per day.
How was the weather last September in London?
This is the weather in London in September 2023:
1 September
🌧️
+22°C
2 September
☁️
+23°C
3 September
☁️
+26°C
4 September
☀️
+28°C
5 September
☀️
+29°C
6 September
☁️
+31°C
7 September
🌫️
+31°C
8 September
☁️
+30°C
9 September
☀️
+32°C
10 September
☁️
+31°C
11 September
☁️
+25°C
12 September
🌧️
+23°C
13 September
☁️
+21°C
14 September
☁️
+24°C
15 September
☁️
+25°C
16 September
☁️
+26°C
17 September
☁️
+20°C
18 September
☁️
+19°C
19 September
☁️
+19°C
20 September
☁️
+20°C
21 September
☁️
+18°C
22 September
☁️
+18°C
23 September
☀️
+17°C
24 September
☁️
+20°C
25 September
☁️
+22°C
26 September
☁️
+23°C
27 September
☁️
+21°C
28 September
☁️
+19°C
29 September
☀️
+20°C
30 September
☁️
+20°C
In September 2023 London had 5 sunny days, 22 cloudy days, and 2 rainy days. The average maximum temperature was +23°C, with an absolute maximum of +32°C and a minimum of +17°C. The average humidity was 81%, with a maximum of 100% and a minimum of 45%. The average wind speed was 3 m/s, with a maximum of 9 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change over Years
This is how London climate have been changing during last 43 years period.
The climate in London in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+12°C) and the highest in 2022 (+17°C). The driest year was 1996 with only 431 mm of rainfall, and the wettest year was 2021 with 1037 mm.
FAQ
Frequently asked questions about the weather in London in September:
Is September a good time to visit London?
September is a really good time to go to London. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit London.
Can you sunbathe in London in September?
September has mild temperatures in London. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Is London rainy in September?
London is usually dry in September. Plan your packing around outdoor activities and exploring.
Is it sunny in London in September?
Usually, it’s not very sunny in London in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
Other cities in United Kingdom
Check out the weather for other cities in United Kingdom.
For this page, we’ve looked at the typical weather in London, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.