Weather in central London
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On 30 September 2026 London experienced a tropical night with temperatures staying above 20 °C, including a Met Office reading of 21.8 °C at 2 am. BBC Weather then forecast thunderstorms for 9 am to 10 am, prompting travel warnings for commuters.
From 20 to 29 September 2026 London will record daily highs of at least 22°C. BBC Weather attributes the warmth to a high‑pressure ridge, and the Met Office forecasts ten consecutive sunny days, meaning residents should prepare for warm, possibly humid conditions.
BBC forecasters say London will not see a heatwave in September, with Met Office temperatures forecast between 24 °C and 19 °C. Thames Water’s hosepipe ban, issued on 23 July, remains active for Barnet, and the Environment Agency warns the drought will persist until nationwide rainfall resumes.
The BBC gives a 47% likelihood of thunder and lightning at about 10 am on Sunday 13 September, and the Met Office expects rain between 5 am and 11 am. Temperatures will reach 23 °C, dropping to 16 °C overnight, prompting residents to carry umbrellas.
Residents in Barnet and across London can expect thunderstorms and a week of rain from 18 August, following record-breaking temperatures of 38.1°C on 13 August. The Met Office and BBC Weather forecast cooler conditions, with showers lasting until 27 August, though the bank holiday weekend may stay dry.
Barnet will see its first rainfall in weeks on 17 August, with light showers forecast for the afternoon, BBC Weather reports. A yellow heat health alert remains in place for London until 19 August, as temperatures stay above 20°C even during rain.
Barnet has recorded 38 consecutive dry days since 23 June, matching the capital’s drought. The Met Office confirms England and Wales had their driest July on record. Light rain is forecast for 10 August, but experts say prolonged rainfall is needed to ease restrictions.
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