Planning a summer trip to the capital? August is London at its most confident: the parks are full, the evenings are long, and the city’s events calendar peaks with Europe’s biggest street festival. Here is exactly what the weather does — and how to plan around it.
London Weather in August: The Short Answer
August in London brings daytime highs around 23°C and overnight lows near 14°C, with roughly 50mm of rain spread over a handful of showery days. Daylight starts the month at about 15 hours and closes nearer 13.5 — evenings stay bright past 8pm. Heatwaves above 30°C happen but rarely last; a light layer for the evening is all most visitors need.
What to Pack
Light clothing with one warmer layer for evenings, comfortable walking shoes, sunglasses, and a compact umbrella — August showers are short but confident. Hotels and the Tube can feel warm during hot spells, so breathable fabrics win.
What’s On in August
The headline is Notting Hill Carnival over the late-August bank holiday weekend — Europe’s largest street festival. Beyond it: open-air cinema and theatre across the parks, lidos in full swing, and every major attraction running extended summer hours.
Crowds and Prices
August is peak season: school holidays across Europe mean the longest queues and the highest hotel rates of the year. Book attractions with timed tickets online, start your days early, and reserve accommodation well ahead.
Verdict
Best weather of the year alongside July — at the price of the biggest crowds. If your dates are flexible and you prefer calm over carnival, consider September; for a like-for-like comparison see July’s weather guide.