Physical exertion should be avoided during the hottest part of the day - and people should check on the vulnerable and the elderly who find the heat particularly challenging.
Dr Agostinho Sousa, head of extreme events and health protection at the UKHSA, said:"Heat-health alerts have now been issued to the majority of the country, with temperatures set to remain consistently high throughout the duration of next week.
"If you have vulnerable family, friends and neighbours, make sure they are aware of how they can keep themselves protected from the warm weather."Meteorologist Annie Shuttleworth said:"We're at the start of a potentially relatively long spell of warm weather for much of the UK away from the far North West, where it's likely to be a bit cooler and cloudier."
Ms Shuttleworth added that temperatures will"come close" to this year's high in London and the South East at the start of next week. The warm weather looks to be settling in for some time to come, according to Met Office forecasting. The average temperature for July is around 20C .
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