An amber heat health alert is in place across southern England this week, with temperatures forecast to hit 34C or higher in some areas. The UK Health Security Agency (UKHSA) issues these alerts when hot weather is likely to have a significant impact on health and social care services.
Heat health alerts are a system used in England to warn the public and public services about periods of high temperatures that could affect people's health. There are two main levels: yellow and amber. Yellow alerts indicate that temperatures could have minor impacts on health and social care, while amber alerts mean there is likely to be an increase in deaths, especially among people aged over 65 or those with long-term health conditions. The current amber alerts cover London, the east, south-east and south-west of England, and are valid until 20:00 BST on Tuesday. Yellow alerts cover the East and West Midlands for the same period.
“Explains what UK heat health alerts are, how they work, and why they matter.”
The alerts come as the Met Office warns that a heatwave is likely to develop this weekend. A heatwave is defined as three consecutive days of temperatures above a threshold that varies across the UK — from 25C in some areas to 28C in others. The current hot weather is being caused by a large area of high pressure over western Europe, sometimes called a "heat dome", which traps warm air underneath it. Temperatures are set to reach 32C on Friday in East Anglia, then rise again on Sunday and Monday, with a 40% chance of exceeding the current UK June maximum temperature record of 35.6C, set in 1957 and 1976.
For UK readers, the practical impacts are significant. Health services may come under increased pressure, and the public is advised to take precautions such as staying hydrated, avoiding the hottest part of the day, and never leaving children, older people or animals in parked cars. The heat can also disrupt travel: railways may need to impose speed restrictions because tracks can buckle in extreme heat, causing delays and cancellations. Drivers are urged to remove items such as medications, aerosols and electronics from their cars, as temperatures inside stationary vehicles can become dangerously high very quickly. The hot and humid conditions may also trigger thunderstorms, particularly in central, southern and south-east England.
Q: What is an amber heat health alert? An amber heat health alert is issued by the UK Health Security Agency when high temperatures are likely to have a significant impact on health and social care services. It indicates an expected increase in deaths among vulnerable groups, particularly those aged over 65 or with long-term health conditions.
Q: How can I stay safe during a heatwave? Stay cool by keeping out of the sun during the hottest part of the day (11am to 3pm), drink plenty of water, avoid strenuous activity, and check on elderly or vulnerable neighbours. Never leave anyone in a parked car, and carry water with you if using public transport.
Q: Why does humidity matter? High humidity makes the air feel muggy and can make it harder for the body to cool down through sweating. This means the heat feels more uncomfortable and can increase the risk of heat-related illness, especially during the night when temperatures may not drop below 20C.
What happens next depends on the weather. Meteorologists expect temperatures to peak on Monday, with a chance that the UK June record could be broken. The amber alert remains in place until Tuesday evening. After that, forecast models show some uncertainty, but heat may linger in the south of England. The Met Office continues to monitor the situation and may update warnings as needed.