Stay away from the edges of waterways, and be careful if swimming in cold water - that is the advice from Water Safety Ireland ahead of the Easter weekend.
Survival time after accidental immersion is much reduced in cold water, it said, as it drains body heat much faster than cold air.
The water is currently around 9 degrees Celsius, said Water Safety Ireland.
People who are not used to cold water swimming should wear a wetsuit, it added.
Outlining some guidelines for walking near waterways and coastal areas this weekend, Water Safety Ireland advised people to carry a mobile phone in case they need to call 112 for the Coast Guard.
Stranding may be a risk for coastal walkers, it said. Parents should watch children closely around water, and alcohol should be avoided before or during any activity on the water, it added.
Anglers should always wear a lifejacket and carry a mobile phone in a waterproof bag, it said.
Cold water risk
Water Safety Ireland said cold shock caused by water can cause a loss of breathing control, possible dizziness and panic, all of which can increase the risk of sudden drowning even if the water is calm and you know how to swim.
Furthermore, if a person survives this but is then unable to get out of the water, progressive body cooling could lead to hypothermia and muscle cooling, which makes swimming more difficult.
Children cool faster than adults because they are smaller and have less fat, the water safety agency said.
If you fall into cold water, "avoid swimming, stay calm and relax. Float or tread water and if possible, get as much of your body out of the water because you will always cool faster in water than in air," said a statement from Water Safety Ireland.
"Wearing a lifejacket with a crotch strap will enable you to lessen heat escape by keeping your legs together and elbows by your side."
