Update: Heat Warning Issued
Millions of people across England and Wales are being urged to take precautions as the Met Office issues a rare red weather warning for extreme heat, with temperatures forecast to approach 40°C later this week. It is only the second time a red heat warning has been issued in the UK.
Forecasters say temperatures could reach between 37°C and 39°C on Wednesday and Thursday, with a small possibility of hitting the 40°C mark in some locations. The current June temperature record of 35.6°C is expected to be broken if forecasts are released.
The red warning covers large parts of England and southern Wales, including London, Birmingham and surrounding areas. The UK Health Security Agency has also issued a red heat-health alert, warning that the conditions could pose a risk to life, even for healthy individuals.
Experts have warned that the combination of extreme temperatures, high humidity and unusually warm nights could place significant strain on health services, transport networks and energy infrastructure. Overnight temperatures are expected to remain above 20°C in some urban areas, creating so-called "tropical nights" that make it difficult for people and buildings to cool down.
Schools, hospitals and transport operators are already preparing for potential disruption. Some schools are considering shortened days, while rail operators are monitoring tracks for heat-related issues. Officials are also urging people to avoid strenuous activity during the hottest parts of the day and to check on elderly or vulnerable neighbours.
The Met Office advises people to stay hydrated, keep homes cool by closing curtains and blinds during the day, and avoid direct sunlight where possible.
Authorities are also warning against swimming in rivers, lakes and reservoirs without proper supervision, as cold-water shock remains a major risk despite the hot weather.
Temperatures are expected to begin easing towards the end of the week, although conditions will remain very warm across much of the country. Meteorologists say the heatwave is part of a wider pattern of extreme weather affecting western Europe, with several countries also experiencing unusually high temperatures.