Weather in London in September
London, United Kingdom averages a high of 18.9°C (66°F) and low of 11.4°C (52.5°F) in September, with 9 rain days and 8.2 hours of daily sunshine. Travel score: 71.7/100 (Good). The best time to visit London is July.
High
19°C66°F
Low
11°C53°F
🌧️
9
rain days
☀️
8.2
hrs/day sunshine
💧
78%
humidity
72— Good
September in London is mild and occasionally wet — good for most activities.
What are the average temperatures in London?
How much does it rain in London in September?
London receives an average of 48.9mm of rainfall across 9 rainy days in September. The annual total is 646.7mm.
What should I pack for London in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 19°C
Recommended
🧥
Light rain jacket
Some rainy days expected (9 days)
☔
Umbrella
Be prepared for occasional showers
🧴
Sunscreen
Sun protection is still recommended
🕶️
Sunglasses
Useful for sunny periods
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Data based on 1994–2024 averages · Last updated: 2024-12-31