A week-long health warning has come into effect as another heatwave is on its way for parts of the UK.
Peak temperatures of 34C are forecast and a new hosepipe ban has been announced.
Temperatures in the South of England could reach 28C on Saturday, according to the Met Office.
It said temperatures are forecast to rise to 29C on Sunday, then approach the low 30s next week, before the South East sees a peak of 34C on Thursday or Friday.
It is expected to be a prolonged spell of hot weather in parts of the UK, but the forecaster said it will not be as hot and humid as last month's heatwave.
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Yellow health alerts issued by the UK Health Security Agency (UKHSA) come into force at midday in parts of the UK, with health officials cautioning that high temperatures over the coming days could cause a greater risk to life for vulnerable people.
The warnings cover the East Midlands, east, southeast and southwest of England, as well as the West Midlands, until 8pm on 11 July.
The agency said minor impacts were likely across health and social care because of the high temperatures within the warning areas, including increased use of healthcare services by vulnerable people and a greater risk to life to the same group.
It also warned of a potential increase in water-related deaths, including risks from cold water shock and drowning.
Meanwhile, Southern Water has issued a hosepipe ban from 12.01am on 10 July in Hampshire and on the Isle of Wight, while South East Water's temporary hosepipe ban for people living in Kent came into force on Friday.
The bans stop customers using their hosepipes for non-essential activities, including watering gardens, using a sprinkler system, filling paddling pools, hot tubs, swimming pools, ponds or fountains, and washing cars, patios or windows.
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Met Office meteorologist Becky Mitchell said: "We have got a heatwave on the way across parts of southern England and Wales, temperatures are already quite high across the South East today, we could get 28C in London.
"Elsewhere, it's not as hot as we have got temperatures closer to average but they will climb as we go into next week.
"The northern areas of the country will be cloudier with spells of rain at times, so there's a north/south split.
"There will be highs of 29C tomorrow in the south. At the start of next week we will see temperatures approach the low 30s."
She added: "The peak of the heat appears to be Thursday or Friday, 34C in the South East.
"By comparison to the heatwave we saw in June, this heatwave won't be as hot and humid, but it will be a prolonged spell of hot weather which lasts around a week."
Last week the UK set a provisional June temperature record of 37.7C in Lingwood in Norfolk, according to the Met Office.
It beat the previous June record for the UK of 35.6C, which dates back to 1976.
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