The UK's hottest day of the year so far - and the warmest September day since 1911 - has been recorded in Gravesend, Kent, where it reached 34.4C (93.9F).
The spell of warm Autumn weather is forecast to continue across parts of England until Friday.
Public Health England (PHE) and NHS England have both warned that the weather can pose a risk to health.
Elsewhere, yellow warnings for rain are in place for some parts of northern England and southern Scotland.
As much as 30mm (one inch) of thundery, torrential rain in places could cause flash flooding and travel disruption through the afternoon and evening, the Met Office said.
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