Extreme heat warnings issued across the UK have placed millions of people on alert as forecasters predict one of the hottest June heatwaves in British history. The Met Office has warned that temperatures could climb to 38°C–39°C in parts of England this week, threatening to surpass the UK’s current June temperature record of 35.6°C, set in Southampton in 1976. Health officials have also issued warnings about increased risks of heat-related illnesses, pressure on healthcare services, and a potential rise in heat-related deaths, particularly among older adults and those with underlying medical conditions.

The UK Health Security Agency (UKHSA) has activated heat-health alerts covering much of southern England, central and eastern Wales, the Midlands, and later parts of Greater Manchester, Yorkshire, and Cheshire. Forecasters expect the heatwave to persist until at least Thursday, accompanied by high humidity and unusually warm nights.

<img class="aligncenter wp-image-86213 size-full" src="https://sigmaearth.com/wp-content/uploads/2026/06/Indias-Climate-Progress-720-x-480-px-1200-x-628-px-1080-x-1080-px-Website-2026-06-22T150104.935.png" alt="Extreme heat warnings issued across the UK” width=”1366″ height=”768″ />

Why Temperatures Are Rising So Rapidly

Meteorologists say the heat is being driven by a large high-pressure system, often referred to as a “heat dome,” stretching from continental Europe into the UK.

According to the Met Office, an expanding mass of hot air centered over France is pushing temperatures higher each day. The combination of sinking air, clear skies, and persistent high pressure is compressing and heating the atmosphere, creating ideal conditions for extreme temperatures.

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Experts Warn of Record-Breaking Temperatures and Wider Impacts

Meteorologists believe the current heatwave could become one of the most significant June weather events in recent UK history. Jim Dale, meteorologist and founder of the extreme-weather educational program The Shield, said temperatures are expected to peak around Wednesday and Thursday, with parts of southeast England, London, and the Home Counties potentially reaching 38°C.

According to Dale, the extreme heat is being driven by a combination of warm continental air moving into the UK and a persistent high-pressure system trapping heat across the country.

National Rail has advised passengers to check travel plans before setting out, as high temperatures can affect railway infrastructure and operations.

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Public Health Advice

The Met Office last issued a similar extreme heat warning in 2022, when UK temperatures reached a record-breaking 40.3°C. With humidity levels expected to rise alongside temperatures, experts stress that the heat may feel more intense than previous heatwaves.

People living within the warning zones are advised to:

• Drink plenty of water throughout the day.
• Avoid direct sunlight during the hottest hours between 11 a.m. and 3 p.m.
• Wear lightweight clothing and use sunscreen.
• Check on elderly relatives, neighbors, and vulnerable individuals.
• Avoid strenuous outdoor activities during peak temperatures.

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A Challenging Week Ahead

As extreme heat warnings issued across the UK remain in place, forecasters expect the hottest conditions to occur between Tuesday and Thursday, particularly across London, the southeast, and the Home Counties. While temperatures may ease slightly later in the week, weather models suggest another surge of heat could arrive by the weekend.

With record-breaking temperatures, tropical nights, and widespread health concerns, authorities are urging the public to take precautions and stay informed as the UK navigates one of its most intense early-summer heat events on record.

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