With the official heatwave now over, Britons can expect the weather to return to average as temperatures cool on Sunday.
There will still be plenty of sunshine across East Anglia and the south-east of England in the morning, the Met Office said.
Temperatures are forecast to climb to 24C in London, while the rest of the south-east of England will enjoy highs of up to 22C.
The weather agency said there will be more cloud across the country, and spells of rain across the northern parts of Scotland, where temperatures will reach highs in the mid-teens.
People in Wales will see temperatures around 18C, while those in the north of England will experience between 18C to 20C.
It follows a record-breaking heatwave, which saw temperatures climb to 35.1C in Kew Gardens, west London, on Tuesday.
Thames Water has asked millions of people in London and the South East to stop using their hosepipes during the heatwave, warning that demand for water has increased by up to 50 per cent as people begin “watering gardens, filling paddling pools and using hoses and sprinklers”.
NHS England said there were 20,092 visits to its heatstroke advice page on bank holiday Monday, compared with 488 the previous Monday. Over the whole weekend, there were 36,724 visits.
On Thursday evening, thousands of people in Whitstable were left without water supply during the hot spell of weather as storage reservoirs for the area “reached a critical level”, South East Water said.
Pictures show traffic and queues of people lined up at a bottled water collection point at a Sainsbury’s near the Kent town, as the water company said 8,000 customers were without supply.
It comes as the firm urged customers to use water for essential purposes only – for drinking, washing and cooking, as supply issues continued from over the hot bank holiday weekend.
On Wednesday, a teenage boy became the 11th person to die in a water-related incident over the course of the recent heatwave.
The hot weather has attracted many to open water swimming, resulting in a number of deaths in South Yorkshire, West Yorkshire, Cornwall, Hampshire, Warwickshire, Cheshire, Pembrokeshire, Lincolnshire and Lancashire.
Met Office chief forecaster Chris Bulmer said: “We’re now starting to see this spell of very hot weather break down.”
He added: “As the heat starts to ease, the weather will also turn more changeable, with some showers and thunderstorms possible.
“By the weekend, temperatures should be much closer to average for the time of year with accompanying rainfall for many through the weekend and into the start of next week.”
On Monday, more low-pressure systems will make their way across the country, with showers expected across most parts of the UK.
Temperatures could still hit 23C in London and areas in the south-east as the week begins, but will stay around the mid-teens for much of the country.
Five-day weather forecast:
Sunday
A fresher feeling day, with a mixture of sunny spells and scattered showers, Showers most frequent in the north. Feeling pleasant in the sunnier moments, especially in the south.
Outlook for Monday to Wednesday
Meteorological summer starts on an unsettled note. Spells of rain on Monday, followed by heavy and thundery showers on Tuesday. Further rain is likely again on Wednesday. Temperatures near average.
