Britons have been urged to keep safe following the deaths of nine people who got into trouble in open water after days of record-breaking heat.
The Royal Life Saving Society issued a plea for everyone to “stop and think” before getting into the water in response to the deaths, most of whom were children.
It noted that “warmer weather unfortunately correlates to an increase in accidental drownings” and that despite warmer air, “water temperatures remain very cold”.
Tuesday was the hottest day in May on record for both England and Wales, according to the Met Office, with Kew Gardens provisionally reaching 35.1C and Cardiff Bute Park reaching 32.9C.
People across the UK have died after struggling in open water in South Yorkshire, West Yorkshire, Cornwall, Hampshire, Warwickshire, Cheshire, Pembrokeshire, Lincolnshire and Lancashire in recent days.
Declan Sawyer, 15, died after getting into trouble at Swanholme Lakes, Lincoln, on Sunday.
Also on Sunday, a 72-year-old woman died after being pulled from the water at West Angle Bay beach in Pembrokeshire, Wales, at around 3.15pm.
A 13-year-old boy, understood to be Reco Puttock, died after getting into difficulty at Leadbeater Dam, near Halifax, West Yorkshire, on Monday, while the body of a teenage girl was recovered from the water at Kingsbury Water Park, Warwickshire.
The same day, a man in his 60s died of cardiac arrest after entering the sea at Tregirls Beach, Padstow, to help two family members who were in difficulty, Devon and Cornwall Police said.
The body of a teenager was recovered from the water at Rother Valley Country Park, Rotherham, in the early hours of Tuesday morning, South Yorkshire Police said.
Another body has been found in the search for a teenage boy who went missing after he was last seen swimming at Hawley Lake on the Hampshire/Surrey border on Tuesday afternoon.
A 12-year-old boy who died after getting into trouble in the River Ribble at Ribchester, Lancashire, on Tuesday was named as Junior Slater from Clayton-le-Woods.
In a tribute, released by Lancashire Police, his family said: “Our little blue-eyed boy.
“He will be truly missed. He was the life and soul of our lives. Words can’t describe how we are feeling right now. We will forever love you Junior.”
On Wednesday, Cheshire Police said the body of a 17-year-old boy was found after he went missing in Pickmere Lake at Marston, Northwich.
Along with nine deaths in the UK, the Gardai in Ireland also said a teenage girl died in the sea at Burrow Beach, a popular swimming spot near Howth, on Sunday.
With parts of the country reaching 29°C today, please share our Summer Water Safety advice to help keep your community safe around water.
— Royal Life Saving Society UK - RLSS UK (@RLSSUK) May 27, 2026
Read our essential summer water safety advice: https://t.co/QHsQ1B40IK pic.twitter.com/tAa3GgYTGo
The RNLI have warned of the “very real risk” of swimming in open water during the heatwave.
Visits to NHS web pages have also surged during the heatwaves as people sought advice on how to stay safe in the hot weather.
NHS England said there were 20,092 visits to its heatstroke advice page on bank holiday Monday, compared to just 488 the previous Monday. Over the whole weekend, there were 36,724 hits.
Elsewhere, people looking for tips on how to deal with sunburn led to 5,342 visits to NHS webpages, with a total of 10,314 over the whole weekend.
Parents also sought advice on how to keep their babies safe, with visits to NHS web pages for baby first aid and sun safety tips surging by almost 3,500% on Monday, with 4,728 hits.
While many people enjoyed the sunny bank holiday weekend, older people and babies can be particularly vulnerable.
There is also a risk of dehydration and heat exhaustion, which is caused by the body losing too much water and salt, and can lead to heatstroke, a life-threatening illness.
Thousands of people in Kent were asked to use water for essential purposes only after high demand during the heatwave caused supply issues.
Matthew Dean, South West Water’s head of operations control, said around 18,000 customers were experiencing water supply issues, and some would have intermittent supply until reservoir levels were restored.
“In preparation for this we have informed customers that while they have a supply they should put aside some water for essential use,” he said.
“We are continuing to ask customers in supply to use water for essential purposes only – for drinking, washing and cooking.
“We have bottled water collection stations already set up and are monitoring.”
Temperatures are expected to cool slightly in parts of the UK in the coming days but health officials have confirmed that heat health alerts would be extended for 24 hours.
#FloatToLive has saved the lives of over 50 people! And they're just the ones we know about 🤯
— RNLI (@RNLI) August 5, 2025
Dexter, Theo, Billie, Tina and Brian all floated when they got into difficulty in the water, and their stories are powerful reminders that this simple skill can save lives.
👇 pic.twitter.com/3c8nJgOuuU
The UK Health Security Agency said amber alerts for the South West, South East, London, East and West Midlands and the East of England will remain in place until 5pm on Thursday, with yellow heat-health alerts for the North West and North East.
The Met office have also issued a yellow thunderstorm warning for much of Wales, the South West of England and parts of the Midlands for 3pm to 11.59pm on Wednesday.
The warning stretches from Plymouth up to Holyhead and could bring torrential downpours of rain, frequent lightning, large hail and strong, gusty winds.
