UK Weather Update: Hottest Day of Heatwave Forecast with Chance of Temperatures Reaching 35°C

Published: 11 August 2025. The English Chronicle Desk

The United Kingdom is bracing for the hottest day of this summer’s ongoing heatwave, with meteorologists warning of a significant chance that temperatures could soar to 35°C in some regions. Sky News meteorologist Christopher England has forecasted “some very muggy nights” especially across southern parts of England, where overnight temperatures are expected to remain above 20°C, creating what is commonly referred to as “tropical nights” in towns and cities.

A yellow heat health alert is currently active from midday onwards for most of England, excluding the North West and North East, and will remain in place through to Wednesday evening. This alert, issued by the UK Health Security Agency, highlights the increased risk of heat-related health issues, including a rise in deaths among those aged over 65, additional pressure on healthcare services, and the vulnerability of certain populations to overheating.

The upcoming surge in temperatures is being driven by the movement of a high-pressure system, which has been responsible for recent warm weather due to the “heat dome” effect. According to Christopher England, this high pressure is shifting eastwards while low pressure advances from the west, bringing even warmer air from continental Europe.

“Southern Britain can expect temperatures widely into the low 30s then, perhaps exceeding 35°C (95°F) in places,” England said. He further noted a roughly 10% probability that Wales could surpass its August record high temperature of 35.2°C, previously set at Hawarden in 1990.

Meteorologist Tom Morgan added that the weather would exhibit a “North-South split” today, with cloudier skies and intermittent rain in Scotland, Northern Ireland, and parts of northern England. Persistent rain is most likely in western Scotland, influenced by the remnants of ex-tropical storm Dexter approaching from the Atlantic. This storm system is expected to bring potential rain and thunderstorms tonight and into Tuesday.

The Met Office defines a heatwave as three or more consecutive days of temperatures exceeding location-specific thresholds ranging between 25°C and 28°C. With the heatwave now entering its fourth occurrence this summer, many parts of the UK are experiencing sustained elevated temperatures, impacting daily life and prompting health warnings.

As the country prepares for these intense conditions, officials urge the public, especially vulnerable groups, to take appropriate precautions to stay hydrated, avoid excessive outdoor exertion during peak heat, and look after neighbors who may be at increased risk during extreme temperatures.