It’s going to be another exceptionally hot day for most of the UK with temperatures soaring into the high 20s to low 30s - but when will the heatwave finally be over?09:38, 26 May 2026Updated 09:50, 26 May 2026The UK is set for a very hot week with blazing temperatures likely to remain after the huge ‘historic’ heat dome descended on Britain, making it the hottest Bank Holiday ever.‌A heatwave was officially declared in eight locations in the southeast of England yesterday, meeting the trigger-point of 27C for three consecutive days of hot weather. Things turned so intense that another heat record for May has fallen after an official "tropical night" was recorded.‌After the UK recorded its hottest ever May Day with temperatures climbing to 34.8C in Kew Gardens, the record for the highest daily minimum for the month was set overnight as the temperature did not fall below 21.3C at Kenley Airfield, south London.‌The UK Health Security Agency has issued amber heat-health alerts for five regions of England, warning of increased pressure on health and social care services. It said the high temperatures could lead to a rise in deaths, particularly among people aged 65 and over or those with underlying health conditions.READ MORE: Stop mosquito bites itching in seconds with doctor's simple tip that costs nothingREAD MORE: Emergency services rush to busy UK beach over 'concerns for teen's safety'Things will get a little cooler soon, but the heat is going nowhere fast. Temperatures will start to gradually decline from the middle of the week but it will still be largely dry with sunny spells. However, many will still experience temperatures in the high 20Cs.‌There's bad news for those who are struggling to sleep - the Met Office expects the heatwave to last until Sunday May 31.The forecaster sets the official three-day heatwave threshold at 25C for Scotland, Northern Ireland, much of Wales, and northern England. For the remainder of England and south-east Wales, the benchmark rises to 26C or 27C.Weather maps from the Met Office show highs of 24C in London at 4pm next Sunday. Meanwhile, other parts of England will see the mercury in the early 20s with conditions dropping as low as 18C in Glasgow and Plymouth.‌The Met Office has said very high temperatures will persist today. "Tuesday will be another very hot day, with a rapid rise in temperatures through the morning," the forecaster said. "A peak of 35C is again expected in London, the Home Counties and Cambridgeshire. More widely temperatures exceeding 30C will again be reached across eastern Wales, and eastern, southern and central England away from immediate coastal areas."We have been warned that non-summer heatwaves could become more common. Britain will need to get used to searing spring conditions as climate change triggers more 'extreme' swings in the weather, experts have warned.‌Asked whether Britain should expect more heatwaves in May as the planet heats up, Professor Chris Brierley, Professor of Climate Science at University College London, told the Mirror: "Most definitely. We expect the impacts of climate change to be most obviously felt through more instances of extreme heat.Content cannot be displayed without consent"These uplifts could occur at this time of year, they could occur in February - you don't necessarily notice them so much then - but they can have some really important consequences for biology.Article continues below"When they come at a time of year that's already hot, then obviously that has some really substantial health consequences."Tuesday forecastAnother sunny and mostly dry day across England and Wales as the heatwave continues. A small chance of a few heavy, thundery showers in the afternoon. Fresher in northern Scotland.Wednesday to Friday outlookTurning fresher in the east with an onshore breeze, but staying very warm elsewhere. Largely dry, although a few showers are possible at times.