Following a busy period of intensive training in preparation for the new season, the lifeguards will be keeping visitors safe on seven beaches along the Causeway Coast and three in Co Down.
The beaches include Benone, Downhill, Castlerock, Portstewart Strand, Portrush West, Portrush East, Whiterocks, Tyrella, Murlough and Cranfield.
From next weekend, the RNLI will take up full-time daily duty on all beaches continuing to Sunday 4 September, when weekend duty will then resume on selected beaches throughout September.
Lifeguards will be on the beach daily between 11am and 7pm on the Causeway Coast and between 10am and 6pm in Co Down.
Speaking ahead of the new season, RNLI lifeguard manager Mike Grocott is encouraging those planning a visit to the beach this summer to bear in mind some key water safety messages.
"The RNLI’s advice for anyone planning a trip to the beach is to check weather and tide times before you go and if planning to go into the water, swim at a lifeguarded beach, between the red and yellow flags," he says.
"Avoid using inflatables in strong winds or rough seas. If you get into trouble, stick your hand in the air and shout for help and if you see someone else in trouble, tell a lifeguard. If you can’t see a lifeguard, call 909 or 112 and ask for the coastguard."
The RNLI is running its annual national drowning prevention campaign Respect the Water throughout the summer months with the charity this year warning the public to watch out for key dangers that can catch people out in or near water.
Central to the campaign are the dangers that can lead to accidental drowning: cold water, unexpected entry into the water, and rip currents and waves.