The UK is bracing itself for a heatwave that's set to deliver far less intense temperatures than its predecessors – but plenty of humidity and rain instead. Forecasters warn that while warm air masses will bring highs in the mid-20s Celsius, they'll be accompanied by higher moisture levels, making it feel muggy.
The Met Office predicts thunderstorms will hit central and southern England, Wales, and Northern Ireland, particularly during hot afternoons when temperatures are expected to peak. Scotland may also experience increased humidity but with less pronounced temperature rises in the north.
Regional breakdowns indicate varied impacts: the South East and Midlands could see temperatures around 28-29 Celsius, coupled with a higher chance of thundery downpours; while Wales and Northern Ireland face similar conditions, with a notable increase in humidity. Scotland's temperatures will likely remain in the high teens to low 20s Celsius but with increased atmospheric moisture.
The Met Office advises caution, especially regarding sudden, localised heavy rainfall and lightning strikes. While extreme heat warnings are not expected, warmth and humidity still pose health risks for vulnerable individuals. Practical safety tips include staying hydrated, seeking shade during the hottest parts of the day, and being aware of driving conditions during thunderstorms.
This shift in heatwave characteristics highlights the dynamic nature of British summer weather – where high-pressure systems driven by dry air have given way to more humid, Atlantic-derived air masses interacting with warmer ground conditions. This pattern is not uncommon for late summer, when the atmosphere can hold more moisture.