A third heatwave in the UK is increasingly likely as temperatures are expected to soar to 30C in some areas this weekend. The forecast comes as a large area of high pressure builds from the Azores towards southern Britain, leading to rising temperatures.
Projected Temperatures Across the UK
By Friday, temperatures in Greater London and the Home Counties could reach 28C, with some locations hitting the 30C mark on Sunday. This would mark the earliest declaration of a heatwave in parts of England this year. The UK has already experienced record-breaking heat, with June 2026 being the warmest on record for England and the second warmest for the UK overall, according to the Met Office.
As heat builds across the country, the UK Health Security Agency has issued yellow heat health alerts for several regions, including the East Midlands, East of England, London, the south-east, and the south-west. These alerts indicate increased risks, particularly for vulnerable populations.
Weather Conditions and Health Alerts
While southern Britain prepares for rising temperatures, northern areas are expected to remain cooler due to prevailing Atlantic air. Cities like Belfast, Liverpool, and Glasgow are forecasted to have pleasant temperatures ranging from 20 to 24C.
Unlike the previous heatwave, this surge in temperature is expected to be less humid initially, potentially making conditions feel more comfortable despite the heat. The forecast suggests that high pressure will dominate the weather, although there remains uncertainty regarding the potential return of southerly winds later in the week.
Understanding the Heatwave Criteria
A heatwave in the UK is officially declared when daytime temperatures reach specific thresholds for consecutive days. For instance, London and the south-east require three consecutive days of 28C, while northern Britain needs just 25C. This weekend could see several regions meeting these criteria, prompting official declarations.
- Forecast highs: 30C in southern England
- Health alerts: Issued for vulnerable populations
- Cooler temperatures: 20-24C in northern cities
“Last month was the warmest June on record for England,” noted the Met Office.
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