A new alert system will warn the public when high temperatures could damage their health this summer in England.
Run by the UK Health Security Agency and the Met Office, it is aimed at reducing illness and deaths among the most vulnerable.
Climate change is likely to make heatwaves more frequent.
UK temperatures rose above 40C for the first time last summer, the country's fourth warmest, with Coningsby, Lincs, reaching a record 40.3C on 19 July (a record at that time).
Today is the first day of meteorological summer in the northern hemisphere.
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