All Regions Europe When ‘longest’ London heatwave will end after 5 days of 30C temperatures Here’s when you will next need to get your umbrella out, according to the Met Office My London – WeatherRead More About Author OTW Observer See author's posts Continue Reading Previous: Exactly how long next heatwave will last and will there be another oneNext: Santorini’s Hidden Worlds Related Stories 26C weather to mark ‘last blast of summer’ in London before rain sweeps in All Regions Europe 26C weather to mark ‘last blast of summer’ in London before rain sweeps in September 19, 2025 Exactly when London temperatures soar to 26C before dropping 10 degrees All Regions Europe Exactly when London temperatures soar to 26C before dropping 10 degrees September 17, 2025 Weather expert gives verdict on chances of thunderstorms in London next week All Regions Europe Weather expert gives verdict on chances of thunderstorms in London next week September 16, 2025