The Met Office has issued a warning for anyone planning to take a dip to beat the heat this week, as an 'Extreme Heat' alert is in place for many regions across England and Wales. The weather service has shared crucial safety guidance for those swimming in cold water, emphasizing that sea-surface temperatures are not as high as they would be in mid-summer.
Cold Water Shock Risks Despite Heatwave
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 meteorological service has also reiterated advice shared by the RNLI. 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."
Cold water shock occurs when water temperatures are 15°C or lower. The average UK and Ireland sea temperatures are just 12°C, and rivers such as the Thames are even colder, even in summer. The condition causes blood vessels in the skin to close, increasing blood flow resistance and heart rate, forcing the heart to work harder and raising blood pressure. This can lead to heart attacks, even in relatively young and healthy individuals.
RNLI and Met Office Safety Advice
Hughes advised: "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." She added: "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."
The Met Office recommends three simple ways to stay safer: check the water temperature (seas and rivers below 15°C pose cold water shock risk), wear a wetsuit if spending any length of time in the water, and wear a life jacket or swimming buoy to increase chances if experiencing cold water shock. Beachgoers can check tide times, wave heights and sea-surface temperatures using the Met Office app.
Additional Heatwave Precautions
People heading to the coast should also be aware of the risks of spending time outdoors during the heatwave. The NHS advises staying in the shade, especially between 11am and 3pm. If you do go outside, wear sunscreen, a hat and light clothes. More information about cold water shock is available on the RNLI website.
