The Coast Guard and RNLI have issued a safety appeal to the public for the festive season.
With many traditional Christmas and New Year swims cancelled due to Covid-19, anyone planning this activity should check the up-to-date guidance, and ensure they have made the appropriate safety arrangements.
With more people taking part in open-water swimming, they're being advised of the risks of cold water shock.
Average sea temperatures at this time of year are between 6 and 10 degrees, which can pose a risk of hypothermia, even for experienced swimmers.
The RNLI and Coast Guard are urging people not to swim alone, only swim in sheltered areas you're familiar with and swim parallel to the shore, stay within your depth, wear a wetsuit and ensure you're visible from the shore be wearing a bright coloured swim cap or tow float.