If you're planning to spend the day at the beach, you'll want to keep more than just sunscreen in mind.

The National Weather Service has issued an Extreme Heat Warning through Saturday night, with temperatures expected to fall between 105 and 115 degrees across New York City.

Health experts recommend drinking plenty of water, taking breaks in the shade or air conditioning, and limiting time outdoors during the hottest part of the day. Older adults, young children and people with certain medical conditions are at greater risk of heat-related illnesses.

At the same time, there's a high risk of dangerous rip currents along Brooklyn's ocean beaches.

Rip currents are powerful channels of water that can quickly pull swimmers away from shore, even if they are experienced swimmers.

"If you're a really strong swimmer, it's hard because it will pull you out there," beachgoer Zachary Gostlin told News 12. "The lifeguards are really good. Anytime they see the kids out there, they just blow the whistle and pull them back in."

If you're heading to the beach, city officials recommend swimming only when lifeguards are on duty. Lifeguards are stationed at New York City beaches daily from 10 a.m. to 6 p.m. during beach season. Stay out of areas marked with red flags or closed signs and never swim after lifeguards have gone off duty.

If you begin feeling dizzy, weak, or sick from the heat, move into the shade or an air-conditioned space immediately and drink water.