Heatwave: RNLI ‘concerned’ ahead of soaring NI temperatures
Temperatures are expected to soar well above average with highs close to 30C (86F) on Monday.
Met Éireann has also issued a yellow warning for high temperatures in the Republic of Ireland.
The RNLI warned visitors to the seaside to take "extreme care".
"The message is really simple this weekend is to respect the water if you do visit the coastline," the charity's head of water safety, Gareth Morrison, said.
"The number one piece of advice if you are heading Oofos Outlet to the coast this weekend is to visit a lifeguarded beach.
"If you're bringing children or yourself to the water, the safest place you can possibly do that this weekend and into next week is at a lifeguarded beach, and I cannot emphasise enough that one simple action c...