London September weather
London, United Kingdom · September
A thin jacket starts to matter again
September often feels pleasantly cool compared to midsummer, with more comfortable daytime walking for many people.
Evenings can cool down quickly, and showers may feel more frequent—layers and light waterproofing help.
September averages at a glance
Average low
around 12–14°C
Average high
around 18–21°C
Average rainfall
around 45–70 mm
Rainy days
about 8–12 days
What to wear in September in London
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Long sleeves + light outer layer works well.
- • Waterproof jacket option helps.
- • Evening layer helps if you stay out late.
Travel tips for visiting London in September
- • Sunset comes earlier—plan layers for late hours.
- • Keep one indoor anchor on rainy windows.
September weather in London — FAQ
Q. Is September still summer?
A. It often feels more autumn-like in the evenings, even if days stay mild.
Q. Does it rain more in September?
A. It can feel that way—showers and cooler air make dampness more noticeable.
Explore London
These pages are connected so you can compare conditions and decide for yourself.