UK Issues Rare Red Heat Warning as Temperatures Expected to Hit 40°C This Week
By System Administrator · Mon Jun 22 2026
The UK Met Office has issued a rare red weather warning for extreme heat as temperatures are forecast to reach 40°C, with the peak expected Wednesday and Thursday.
The United Kingdom's Met Office has issued a rare and serious red heat warning, forecasting that temperatures could soar to 40 degrees Celsius in parts of the country in one of the most extreme heatwaves the nation has ever experienced.
The red weather warning — the highest level issued by meteorologists — covers a significant portion of England and was issued as forecasters predicted the peak of the heat event to occur on Wednesday and Thursday this week.
A red warning means the weather is expected to have a high impact on people and infrastructure. The public has been urged to stay indoors during the hottest parts of the day, stay hydrated, and check on vulnerable people including the elderly and those with health conditions.
The extreme heat is linked to a persistent high-pressure system drawing hot air from southern Europe and North Africa northward into Britain. Climate scientists have long warned that such extreme heat events would become more frequent and intense as a result of climate change.
Hospitals and healthcare providers have been put on high alert, with NHS England warning of increased emergency admissions due to heat-related illnesses. Train operators have also cautioned that rail lines may buckle under the extreme heat, potentially causing delays and cancellations.
This is only the second time the Met Office has ever issued a red heat warning, the first having been issued in 2022 when temperatures exceeded 40°C in the UK for the first time on record.
Residents in affected areas are being advised to avoid unnecessary travel, wear light clothing, and apply sun protection. Schools and workplaces may also be affected as the country prepares for what forecasters are calling an historic heat event.