The Met Office said Sunday was "another hot day" in southern England, where top temperatures reached 34C at Herstmonceux, East Sussex, and 33.8C at both Heathrow, London, and Gosport, Hampshire.
But this will end abruptly this week, as the Met Office said that "severe thunderstorms" may break out from Monday through to Thursday and issued yellow warnings for thunderstorms.
The Met Office added that "not everywhere will see them, but where they do occur they could be significant and disruptive".
The Met Office added that these would be fairly isolated instances.
A woman in her 30s died after getting into difficulties in the sea at Waxham on Sunday afternoon, Norfolk Constabulary said.
South East Water urged its customers to put away their hose pipes, garden sprinklers and garden water toys as it said that a spike in demand had left some people with low pressure or no water
Saturday's top temperature was 34.5C, which was recorded at Frittenden in Kent, Wiggonholt in West Sussex, and Herstmonceux in East Sussex, the Met Office said
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