The alert means it is likely there will be a rise in deaths, particularly among those ages 65 and over or with health conditions, according to the UK Health Security Agency (UKHSA)14:09, 26 May 2026Updated 14:28, 26 May 2026An amber health alert has been extended for multiple UK regions as temperatures are set to soar to 35C on what could be the hottest May day since records began.‌The warning means it is likely there will be a rise in deaths, particularly among those ages 65 and over or with health conditions, according to the UK Health Security Agency (UKHSA). High temperatures are also likely to severely impact health and social care services.‌It comes as the UK saw its all-time hottest spring temperature on record when Kew Gardens in south-west London rose to a blistering 34.8C on Monday.‌The UKHSA said amber alerts for the South West, South East, London, East and West Midlands and the East of England will now remain in place until 5pm on Thursday May 28, along with yellow alerts for the North West and North East.The alerts had previously been in place until 5pm on Wednesday May 27, while the yellow alert issued for the South West has also been escalated to amber.‌The heat is considered to be dangerous for some vulnerable groups, including older adults as their bodies struggle to regulate temperature. Age UK recommended staying inside during the hottest hours of the day, between 11am and 3pm, and having regular cold baths or showers.The hottest May temperature could be broken again today with highs of 35C forecast across large swathes of southern England and Wales - which could even creep up to 36C, the Met Office said.Thunderstorm warnings have meanwhile been issued for parts of the South West, West Midlands, East Midlands and East of England between 3pm and 10pm on Tuesday. Lightning, hail and gusty winds are expected, the Met Office said, while there is potential for 30mm of rain in less than an hour, which may help ease the heat.‌Yesterday, the UK experienced a "tropical night" as the record for the warmest minimum temperature for May was broken for the second consecutive day. Temperatures did not fall below 20C overnight on Monday in parts of the UK, with 21.3C recorded at Kenley Airfield, south London.Met Office chief forecaster Andy Page said the "exceptional" late-spring heat will continue for much of this week, with more "tropical nights" expected.Article continues below"Last night provisionally recorded the warmest May night on record, and we're likely to see further very warm nights in the south over the coming days," he said."There is a chance a few places will experience a 'tropical night' in the south of England and in Wales tonight, which is where temperatures don't fall below 20C."