In some areas, temperatures could reach 30C.
The UK Health Security Agency (UKHSA) alert – the second in two weeks – which covers London, the East Midlands, South East, South West and East of England, will last until 6pm on Tuesday.
A yellow heat health alert also covers Yorkshire and the Humber and the West Midlands over the same period.
Significant heatwave to finish June, but not as hot this time for northern and western areas.
Temperatures in south-east could peak at 34/35C 🥵
(June record is 35.6C set in 1976 & 1957) pic.twitter.com/ih70DKxE8q
— Matt Taylor (@MetMattTaylor) June 27, 2025
The previous amber health heat alert was issued for all parts of England on 19 June, the first time it had been used since September 2023.
The UKHSA alerts are designed to warn health and social care workers about the impacts of hot weather on their services, including possible weather-related deaths in those aged 65 or with long-term conditions. They are not public weather warnings.
Europe is also facing severe weather, with wildfires breaking out just south of Athens on Thursday and authorities banning outdoor activity and non-essential travel for building and delivery staff on Friday.
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Meanwhile, storms in France and Germany have left at least three people dead and authorities in Spain are warning residents to stay indoors due to hotter-than-normal temperatures.
Met Office meteorologist Jonathan Vautrey said: “The big talking point at the moment is the rise in temperatures we’re going to be seeing over the next few days.”
Conditions in Glastonbury, where more than 200,000 festival-goers will be exposed to the heat, are expected to be between 26 and 27 degrees this weekend.
