The heatwave threshold will likely be met for some areas over the weekend before the week begins with an amber extreme heat warning, with temperatures potentially climbing to or above 34°C.
Amber Warning in Place
The Met Office warning is in effect on Monday and Tuesday for London, the east and southeast of England, and parts of the southwest of England and Wales. It highlights potential health impacts for vulnerable people and heat-related issues for the wider population, as well as a possible increase in water safety incidents.
This warning, distinct from amber heat health alerts issued by the UK Health Security Agency (UKHSA), comes as another heatwave is expected to sweep parts of the UK over the weekend and early next week.
Temperature Forecast
Areas in southern and eastern England are likely to meet the heatwave threshold during the weekend. The Met Office noted a 40% chance of exceeding the highest-ever June temperature of 35.6°C, set in 1957 and 1976.
Saturday could see highs of 28°C before temperatures rise again on Sunday. Some areas in the south and southeast of England are forecast to reach 32°C on Sunday and then push to 34°C or above on Monday, with similar highs expected on Tuesday.
Overnight temperatures may remain above 20°C on Monday and Tuesday, particularly in urban areas.
Health Alerts and Advice
Amber heat health alerts are in force by the UKHSA for the east, southeast, and southwest of England, as well as London, until 8pm on Tuesday.
Greg Wolverson, deputy chief forecaster at the Met Office, said: “While heatwave criteria will be met for some in the south and southeast of England over the weekend, with temperatures into the low 30s possible, the warmth will expand and intensify at the start of next week, which, coupled with high temperatures overnight, leads to potential impacts.
“Temperatures will peak around the mid-30s on Monday and Tuesday. The humidity will also mean this feels close, warmer and more uncomfortable for many. Tropical nights – where the temperature doesn’t drop below 20°C – are also likely for some.”
The warmth may bring some thundery downpours on Monday and Tuesday, though these should be fairly isolated, the Met Office said.
Very high temperatures could continue across a smaller part of the country into the middle of the week, but this remains uncertain.
Water Safety Concerns
At least 15 people died after getting into trouble in open water during a hot spell in May. Samantha Hughes, national water safety partner at the Royal National Lifeboat Institution, said: “With warmer weather approaching, it’s important to remember that the water is still cold. Entering it unexpectedly can lead to cold water shock, causing a sudden increase in breathing and heart rate, which may trigger panic.”
After the heat health alerts were issued, the Health and Safety Executive (HSE) said employers must ensure their workers are protected while maintaining productivity during the heatwave.
