Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The average high-temperature in September, at a comfortable 19°C (66.2°F), reveals a modest deviation from August's 21.9°C (71.4°F). An average low-temperature of 11.3°C (52.3°F) is observed during September nights in London, United Kingdom.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. In London, during the entire year, the rain falls for 151.7 days and collects up to 370mm (14.57") of precipitation.Snowfall
In London, United Kingdom, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 38min.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, in London, sunrise is at 7:00 am and sunset at 6:40 pm BST.
Sunshine
In London, the average sunshine in September is 7.1h.UV index
In London, United Kingdom, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for London in September?
What is the average humidity in September in London?
How many days does it rain in September in London?
When it does not snow in London?
How many hours of daylight does London have in September?
When are sunrise and sunset in September in London?
How long on average sun shines in September in London?
What is the UV index intensity in September in London?
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).
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).
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).
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%).
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).
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).
Average snowfall in September
London, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (16mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
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).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
London, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 7h and 1min
The month with the most sunshine is August (Average sunshine: 7h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).
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).
Average UV index in September
London, 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, November and December (UV index 2).
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).
Average visibility in September
London, United Kingdom
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, June, July, August, October and December (9km).
The months with the lowest visibility are September and November (8km).
London, United Kingdom
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