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A weekend heat-health alert has been raised from yellow to a more severe amber warning in eastern and southern England, and the Midlands.
The amber alert - in place from 09:00 BST on Friday - indicates high temperatures could affect all ages and impact the health service.
The alert, issued by the UK Health Security Agency (UKHSA), continues until 09:00 BST on Monday.
Temperatures are forecast to hit 30C and some thunderstorms are expected.
A less severe yellow alert, which advises people to check on vulnerable family and friends, is in place for the north of England and London.
The UKHSA first issued a heat alert on Wednesday, but raised it saying the temperatures would rise rapidly in affected areas with temperatures high overnight.