August in London averages a daily high of 25.8°C with nights around 14.7°C. Expect roughly 9.6 wet days totalling 78.8mm. 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. 21 years of August data.