London weather in September
Long-run climate averages for London, England in September, plus what the forecast models say for the days ahead.
In September, London averages 21°C by day and 13°C at night. It is the wettest month of the year here.
September in London averages a daytime high of 21°C and an overnight low of 13°C, which reads as mild for this part of the world. It is also the wettest month, so build rain into any plan. Across the whole year London sees roughly 836 mm of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live London forecast with every model compared and how much they currently agree.
London weather by month
what to expect in London through the yearHere is London's typical weather in each month: the average daytime high and overnight low in °C, how each month feels, and the wettest month marked. Use it to plan any trip to London by season.