The Met Office has issued a warning for anyone planning to swim in the sea or other open water during the current heatwave. With an 'Extreme Heat' warning active across many parts of England and Wales, the meteorological service is urging beachgoers to be aware of the dangers of cold water shock.
According to the Met Office website: "People heading to the coast should be mindful that sea-surface temperatures are not as high as they would be in mid-summer." The service reiterated advice from the RNLI, the UK's leading water safety charity.
RNLI Advice on Cold Water Shock
Samantha Hughes, National Water Safety Partner at the RNLI, said: "With warmer weather approaching, it’s important to remember that the water is still cold. Entering it unexpectedly can lead to cold water shock, causing a sudden increase in breathing and heart rate, which may trigger panic."
She added: "If you find yourself struggling in the water, remember to Float to Live: tilt your head back so your ears are submerged, relax and control your breathing. You may need to gently use your hands to help you stay afloat, and it’s ok if your legs sink—everyone floats differently."
Hughes also advised: "Where possible, always choose a lifeguarded beach, and swim between the red and yellow flags. In a coastal emergency remember to call 999 for the coastguard."
Three Simple Safety Tips
The Met Office shared three simple ways to stay safer in the water: check the water temperature (seas and rivers below 15°C can cause cold water shock), wear a wetsuit if spending extended time in the water, and wear a life jacket or swimming buoy to increase survival chances if cold water shock occurs.
The RNLI notes that anything below 15°C is defined as cold water, which can seriously affect breathing and movement. Average UK and Ireland sea temperatures are just 12°C, and rivers like the Thames are even colder, even in summer.
Health Risks of Cold Water Shock
Cold water shock causes blood vessels in the skin to close, increasing blood flow resistance and heart rate. This forces the heart to work harder and raises blood pressure, potentially leading to heart attacks even in relatively young and healthy individuals.
Beachgoers can check tide times, wave heights, and sea-surface temperatures using the Met Office app. The RNLI provides further information about cold water shock on its website.
