September · United Kingdom
Best time to visit London in September Weather, crowds & prices
Weather in London in September
Average temperature 16°C, 63 mm of rain, about 6 days with 6+ hours of sunshine and 80% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
7.5/10
Ranked #5 of 12 months
- Avg temp
- 16°C
- Rainfall
- 63 mm
- Humidity
- 80%
- Days with 6h+ sun
- 6
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in London scores 7.5/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 16°C, 63 mm of rain, and roughly 6 days with 6+ hours of sunshine this month.
A historic capital of theatres, museums, and rain-kissed culture, where mild summers invite leisurely strolls through its storied streets.
September holds up well in London — 5th best month
September averages 16°C (61°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 63 mm, so plan one flexible day in three; you still get about 6 days with 6+ hours of sunshine and 12.4 hours of daylight.
It scores 7.5/10 here, 5th of 12 months, against 9.4/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Figure on mid-season pricing, with crowds are moderate.
Flexible dates? June scores 1.9 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in London in September?
- In September, London averages 16°C, 63 mm of rain, and about 6 days with 6+ hours of sunshine. Its climate-comfort score is 7.5/10.
- Is September a good time to visit London?
- September earns a 7.5/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in London in September?
- Expect about 63 mm of rain in September. Average humidity is 80% and there are about 6 days with 6+ hours of sunshine.
Curated in London
Tickets & experiences
Things to do in London
London, United Kingdom. Live activities and tours from GetYourGuide, matched to this destination.