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It will be a less hot day for most today but it will still feel warm with temperatures reaching 28C (83F) in the east.
Showers in the far north will soon clear to leave some sunshine this morning.
Further showers, heavy and thundery at times will spread into southern areas this morning before they move northwards this afternoon.
Sunnier and fresher conditions will spread in from the southwest as the showers clear.
Hundreds more people called emergency services today as the older and more vulnerable suffered health problems in the heat.
Britain baked in the hottest July day on record, with the mercury peaking at 36.7C (98.06F) at Heathrow in London.
Centra Pulse, which provides personal alarms and fall detectors, said it received an average of 500 calls an hour compared to the usual 300. And ambulance services also reported a spike in calls.
Calls to South East Coast Ambulance Service doubled overnight, and shot up 18 per cent compared to Wednesday last week.
A spokeswoman said most were from elderly or long-term sick people suffering from the heat, and not from sunburn or heat exhaustion.
And London Ambulance Service said it had seen a 28 per cent rise compared to last week, with a 29 per cent increase in reports of breathing problems and a 35 per cent increase in people fainting.
Staying hydrated and keeping to the shade are among recommendations by health experts.
Tennis players competing at Wimbledon and fans watching the action today have had to battle through the hottest temperature ever recorded at the competition.
The observation site at Kew Gardens - the closest one to the courts - hit 35.7C (96.26F) this afternoon.
The temperature has hit the hottest ever for a July day, with highs of 36.7C recorded at Heathrow.
The previous record was 36.5 °C in 2006.
Heathrow has recorded the hottest temperature of the year so far at 35.7C, narrowly pipping Wittering where 35.3C was recorded.
A chimpanzee has been pictured cooling down with an ice lolly at Chester Zoo as Britain wilted in the hottest day in nine years
Latest ITV News reports
Cooler temperatures are forecast after thunderstorms and heavy downpours hit parts of Britain after the hottest July day on record.
After a sweltering day, where temperatures reached a record high for July, the weather turned.