Health officials have issued a new yellow heat health alert for southern England and parts of the Midlands on Wednesday.
The approaching high temperatures could disrupt social care and medical services.
The UK Health Security Agency (UKHSA) mandate takes effect from midday on Saturday, July 4, until 5 p.
m. on Wednesday, July 8.
The warning covers London, the East Midlands, the South East, the South West, and eastern England.
Minor impacts on health infrastructure are anticipated due to the rising temperatures, according to the UKHSA.
Officials noted that the hot weather heightens risks for vulnerable populations.
The conditions also increase the likelihood of water-related accidents, such as drowning or cold-water shock.
High indoor temperatures remain a primary concern for the affected regions.
The Met Office anticipates a potential return to heatwave conditions over the upcoming weekend.
"The forecast for this weekend suggests that temperatures could approach high 20C across parts of England, perhaps 30C in parts of the southeast, with values of mid to high 20C in Wales," said Tony Wisson, Met Office deputy chief forecaster.
The agency noted that while temperatures will rise, the severity is not expected to match the previous week's extreme weather.
"Although a return to heatwave conditions is looking increasingly likely for some areas, the likelihood of such extreme high temperatures or high levels of humidity as last week is currently low," said Tony Wisson.
The current alert follows a record-breaking June that prompted a rare red heat health alert across several UK regions.
The Met Office reported a confirmed record of 37.3C in Santon Downham, Suffolk.
Meteorologists are currently awaiting verification of a 37.7C reading in Lingwood, Norfolk.
Either measurement surpasses the previous June record of 35.6C set in Southampton in 1976.
"This has been unprecedented heat for the month of June and provides further evidence of how high temperature extremes are becoming increasingly common in the UK as a result of human-induced climate change," said Greg Wolverson, Met Office deputy chief meteorologist.
Meteorologists attributed the recent severe weather event to a heat dome that settled over western Europe before moving east.
The World Health Organization reported over 1,300 heat-related deaths across the continent during that period.
Approximately 1,000 of those fatalities occurred in France alone.
Looking ahead, forecasters predict variable cloud and sunny spells for many on Wednesday, with warm conditions in the south and east.
Thursday will see patchy rain clearing the far south, remaining largely dry elsewhere.
Heading into the weekend, southern regions will remain dry with temperatures rising under strong sunshine, while northern regions continue facing cloud and rain.
