London weather in September (Greater London, United Kingdom)

You can expect very pleasant temperatures during the day in September. The average maximum daytime temperature in London in September lies at 19.3°C (66.74°F). The average minimum temperature goes down to around 9.7°C (49.46°F) (often the minimum temperature is noted at night).

Rainfall during September is moderate with an average of 64mm (2.5 inches). There are generally around 10 rainy days. The sun will show itself now and again, with 155 hours of sunshine during the entire month.

 

London, monthly averages in September

Show in Celsius

Min Temperature 49 °F  

Max Temperature 66 °F  

Chance of Rain 34%  

Precipitation 3 in  

Rainy days 10 days  

Humidity 73% *  

Sunshine 155 hrs *  

Percentage Sunshine 40% *  

Where to stay in London

Where to go in the United Kingdom in September

Find out more about the weather in the United Kingdom in September and which places have the best weather conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20-29ºC / 68-84ºF and not too much precipitation (less than 90mm / 3.5inches a month).

So what to wear in September? Bring a rain jacket in case it rains during your stay. Plan on layering your clothes, as some days or part of the day it can be nice and warm, while other times it can get quite chilly. At night it tends to cool off so best to pack some warm nightwear as well.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do in September.

Swimming

6/10

Cycling

10/10

Walking

10/10

Barbeque

7/10

Camping

4/10

Outdoor sports

10/10

Interested in more climate information?

Weather and Climate provides you with all the information you need about the climate in London.

Our site offers climate and forecast data for almost all countries in the world. Are you going to the United Kingdom? On this website you can find historical weather averages for many cities in the United Kingdom. Not sure yet where to go? We now have a tool which suggests which destination suits your ideal climate conditions. Find out where to go with our weather planner.