Following a brief respite, Britain is preparing for its third heat wave of the year, with temperatures building gradually across the nation. Chief Meteorologist Jason Kelly from the Met Office has indicated that warmer weather will resume with predictions of temperatures climbing to 31 degrees Celsius (approximately 88 degrees Fahrenheit) on Thursday and rising to 32 degrees Celsius (almost 90 degrees Fahrenheit) on Friday in certain parts of England and Wales.

In the upcoming days, the UK is set to experience its official designation of a heat wave, defined by the Met Office as three continuous days where temperature thresholds are surpassed. In Scotland and Northern Ireland, the threshold is marked at 25 degrees Celsius (77 degrees Fahrenheit), while the mark for London and nearby regions is set at 28 degrees Celsius (82.4 degrees Fahrenheit). As most of England, eastern Scotland, and eastern Northern Ireland are projected to meet this heat wave classification, areas that do not may still encounter above-average temperatures.

In response to the impending conditions, the U.K. Health Security Agency has issued yellow heat alerts — its most basic warning level — for all counties across England lasting through Tuesday. The agency has cautioned against potential adverse effects on health and social care services, noting an increased risk to the well-being of populations, particularly affecting older individuals during this hot spell.