People across Britain are being advised to take extra care after health leaders issued a heat-health alert, warning that rapidly rising temperatures could endanger thousands of vulnerable residents.
The UK Health Security Agency (UKHSA) said the current spell of hot weather increases the risk of dehydration, heat exhaustion and, in severe cases, life-threatening heatstroke. Older adults, young children and people with existing medical conditions are considered especially at risk. A UKHSA spokesperson warned that hot weather can be hazardous for the most vulnerable and urged the public to take straightforward measures to stay cool and well hydrated.
Officials are encouraging people to limit demanding physical activity during the hottest hours, keep indoor spaces as cool as possible and drink fluids regularly as temperatures continue to rise.
The warning comes as concern grows over the wider effects of extreme heat, with climate specialists noting that heat events are becoming both more common and more severe. Professor Hannah Cloke, a climate scientist, said the UK is seeing a clear shift towards more frequent and intense heatwaves, creating an increasing threat to public health.
According to the UKHSA, anyone can fall ill if they become overheated, but the highest-risk groups include people aged 65 and over, babies, young children, pregnant women and those living with conditions such as heart disease, respiratory problems, diabetes and dementia.
The agency also pointed to heightened risks for people who spend long periods outdoors, including workers, runners and cyclists, as well as those who are homeless or living in housing that is hard to keep cool.
Health officials recommend staying out of direct sunshine between 11am and 3pm, when UV levels are at their strongest, and using appropriate clothing, wide-brimmed hats and sunscreen when going outside.
The public is also being asked to look in on older relatives, neighbours and friends who may find it harder to manage in the heat.
With temperatures climbing, Age UK is urging older people to take the risks of extreme heat seriously and not dismiss the potential dangers.
Caroline Abrahams, charity director at Age UK, said: “Older people can be particularly vulnerable in hot weather, so it’s vital they stay hydrated, keep cool and avoid the midday sun.”
The warning underlines the growing health threat posed by rising temperatures. According to UKHSA, an estimated 2,803 people aged 65 and over died as a result of heat in England during 2022, the year Britain recorded temperatures above 40C for the first time.
Experts warn the annual number of heat-related deaths could triple by 2050 if temperatures continue to rise. A recent report noted: “Without significant action, heat-related mortality is projected to increase substantially in the coming decades.”
Hot weather can place additional strain on the body, increasing the risk of heart attacks, strokes and respiratory problems.
The agency said many heat-related illnesses are preventable if people take simple precautions, including drinking water regularly, keeping curtains closed in sun-facing rooms and opening windows at night when temperatures fall.
It also warned against leaving children, older people or pets in parked cars, which can become dangerously hot within minutes. One of the biggest dangers is heatstroke, a medical emergency that occurs when the body can no longer cool itself down.
Symptoms include confusion, rapid breathing, a fast heartbeat and hot skin that is no longer sweating. Anyone suspected of suffering heatstroke should be cooled down immediately and 999 called without delay.
UKHSA said it will continue to work with the Met Office throughout the summer to issue heat health alerts whenever temperatures are forecast to reach levels that could threaten public health.
The agency’s advice is simple: “Stay out of the midday sun where possible, drink plenty of fluids, keep homes cool and check on those who may be vulnerable as the mercury rises.”
