(CNN) Lifeguards in North Carolina reported 20 rip current-related rescues Monday, National Weather Service Forecaster Dave Loewenthal told CNN.

Ten rescues were reported at Wrightsville Beach and another 10 were reported at Carolina Beach, Loewenthal said. Both beaches are near Wilmington on the southeastern North Carolina coast and had temperatures in the mid-80s and low-90s Monday.

The beaches were packed with swimmers on a very hot Memorial Day, Loewenthal said, adding that rescues might have been necessary partially due to the crowded conditions.

The beaches were only at moderate, or yellow, risk for rip currents Monday.

"It's so crowded, if it was a normal day they probably wouldn't have had as many rescues," Loewenthal told CNN.

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