London is set for a return to sweltering temperatures this week with the capital’s fourth heatwave of the summer.
Parts of west London will see some of the hottest weather in the country on Tuesday, with Heathrow forecast to bask in 34C heat.
The area saw the highest temperature in the UK on Monday with 31.9C.
On Wednesday, parts of England could see 33C and 34C temperatures, including Lincolnshire, South Yorkshire and East Anglia.
Thursday may see 29C to 30C in London and East Anglia.
An amber heat health warning is in place for London from 9am on Tuesday to 6pm on Wednesday, along with parts of the midlands and the south east. Yellow heat health warnings are in place for the rest of England.
The agency has warned of significant impacts across health and social care services due to the high temperatures, including the potential for a rise in deaths, particularly among those aged 65 and over or with health conditions.
The London Ambulance Service has warned that it is expecting a very busy period for the emergency services due to the heat.
The LAS asked Londoners to take extra care and to check on elderly relatives and neighbours.
While the hot weather has also led to a high air pollution alert being issued for London.
More very hot weather and a @UKHSA heat warning in London this week. Take extra steps to stay well:
— London Ambulance Service (@Ldn_Ambulance) August 11, 2025
💧 Stay hydrated
🧴 Wear sunscreen
⛱️ Find shade
💊 Carry your medication / inhaler
💚 Check on elderly relatives / neighbours
Use 111 if you need urgent medical advice. pic.twitter.com/RNZaU25cof
Meanwhile, National Rail warned that the hot weather may cause trains to be disrupted, explaining that heat can cause overhead lines to expand and sag, create line-side fires and cause rails to buckle.
An official UK heatwave takes place when a location records at least three consecutive days with daily maximum temperatures meeting or exceeding the heatwave temperature threshold. This varies across the country and in London, that temperature is 28C.
It comes as experts warn England is facing “nationally significant” water shortfalls despite rain in July, as the country faces more hot, dry conditions.
The national drought group, which includes the Met Office, regulators, government, water companies and other organisations, has met as five areas of the country remain in drought, with six more in prolonged dry weather status.
England is seeing widespread environmental and agricultural impacts from the lack of water, which is hitting crop yields, reducing feed for livestock, damaging wetlands and river wildlife, and increasing wildfires, the group said.
Experts warn climate change is driving more extreme weather conditions in the UK, worsening drought and dry spells, and making heatwaves more frequent and severe.
Despite unsettled weather in July with many places seeing heavy rain or showers, it was still the fifth warmest on record.
