July in London averages a daily high of 26.9°C with nights around 15.5°C. Expect roughly 10.7 wet days totalling 80.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit London is May–September.
Based on LONDON CS, ON CA (8.7km), 1995–2024. 20 years of July data.