Forecasters are warning that temperatures in parts of the UK reach near 30°C this weekend, ahead of a potential third heatwave this year.
Today, highs of 28°C are expected in the southeast of England, as temperatures across the south stay above 20°C.
Sunday, however, will see highs of 29°C in London but the heat will continue to build into next week as Monday could see highs of 31°C before a possible peak of 34°C later in the week as the UK is gripped by a third heatwave.
While this latest hot spell is not expected to be as intense as the record-breaking heatwave earlier this month which saw a new June record of 37.3°C, it’s predicted to last significantly longer, potentially into the middle of the month.
The UK Health Security Agency has issued a yellow heat health alert covering much of England this week (Photo: Brook Mitchell/Getty)How hot will it get?
Health officials have warned that rising temperatures over the coming week pose a threat to vulnerable people.
A yellow heat health alert has been issued by the UK Health Security Agency (UKHSA), covering the East Midlands, east, south-east and south-west England, including London, from 12pm today until 8pm next Saturday.
“At the moment, we’re expecting temperatures in the high twenties this weekend in the south-east,” Met Office meteorologist Becky Mitchell told The i Paper. She added that temperatures could reach as high as 34°C in parts of the south next week.
A heatwave is declared in the UK once daytime temperatures meet certain thresholds. In London and the south-east, three consecutive days of 28°C are needed, while in northern Britain it is 25°C.
“By Monday, some areas will have seen three days of their threshold being met, mainly in the London and Southeast area,” said Mitchell. “By Thursday, lots more areas will start to have met those heatwave thresholds.”
A man uses a shopping bag to shield his face from the sun while walking near Tower Bridge (Photo: Reuters)A hosepipe ban is to be implemented across Hampshire and the Isle of Wight from 10 July in response to the spiking temperatures.
Southern Water said the restriction is being put in place after the recent record-breaking heatwaves left river levels 25 per cent lower than expected for this time of year. The firm said the River Test had lost a third of its water within the last month.
A hosepipe ban is also in force across Kent which South East Water said would be kept “under constant review”.
The Met Office has said temperatures in northern areas are not forecast to reach heatwave levels, with temperatures across the north of England and Scotland staying in the mid to high teens today and levelling off at 20 to 24°C throughout the week.
Areas on the west coast of the UK, including Lancashire, the Lake District, western Scotland and Northern Ireland, will be exposed to an Atlantic breeze which will limit temperatures to the low to mid-20s.
The Met Office said Northern Ireland will stay mainly dry with odd showers over the weekend and going into next week, adding that temperatures in the region will reach a maximum of 19°C.
Wales, meanwhile, will experience bright and sunny spells over the weekend and into next week, with light winds and a maximum temperature 23°C.
A so called ‘Azores high’ is to bring hot temperatures for parts of southern England over the next week. (Photo by CARLOS JASSO / AFP via Getty Images)How long will the heat last?
Forecasting models are currently predicting that the hot weather could persist into the middle of July, although it is still unlikely to reach the record-breaking temperatures we saw in June.
Mitchell said the heat will peak “on Thursday or Friday, where we could get highs of about 34°C in parts of the south,” adding: “After that, temperatures will probably gradually come down a little but we could still see the high twenties or low thirties until the end of the week.”
The Met Office has also warned that a long-lasting marine heatwave is likely to reach extreme levels next week, potentially prolonging warmth on land, and increasing night-time temperatures.
“Marine heatwaves around the UK have developed rapidly following the recent heat dome, and we are now seeing widespread strong to locally severe conditions,” said Dr Ségolène Berthou, Air-Sea Interaction Specialist at the Met Office.
“While these warmer seas did not significantly increase peak temperatures on land, they reduced night-time cooling and helped sustain warmth, particularly in coastal areas.
“With further sunny and calm weather likely next week, there will be little opportunity for the ocean to release this excess heat. This means the surface marine heatwave could intensify further, potentially reaching extreme levels in the south.”
What is causing this hot spell?
The Azores High – a large semi-permanent centre of high atmospheric pressure – is expected to extend north-eastwards next week, driving a ridge of high pressure across the UK, while the jet stream shifts further north.
This will allow high pressure to block Atlantic low-pressure systems, leading to a more settled weather pattern of sunshine, dry weather and another spike of summer heat across much of the country.
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