06/06/2026
weather in June, with the full June-to-August period carrying an increased risk of heatwaves and heat-related impacts.
That matters now because the country is entering meteorological summer on the back of a late spring heatwave that already pushed temperatures high enough to set records and strain services. In the south-east of England, mains water supply issues appeared last week as demand surged in hot weather, while yellow and amber heat health alerts were issued for the first time this year.
The numbers give the warning some weight. A new all-time May temperature record of 35.1C was set at Kew Gardens, London, beating the previous mark of 32.8C from 1944. The Met Office said a hotter summer is now twice as likely as during the 1991-2020 reference period, a shift that points to a season where heat may return more often, even if it does not arrive in one long, clean stretch.
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