The National Weather Service has issued a high surf advisory for south facing shores of all Hawaiian islands, effective until 6 p.m. Wednesday.

A long-period, south-southwest swell will produce elevated surf of 7 to 10 feet along south shores through this evening before lowering to 6 to 8 feet late tonight and Wednesday.

Officials warn of strong, breaking waves, shore break, and strong rip currents, which make swimming difficult and dangerous.

“If in doubt, don’t go out,” officials said.

Surf on north shores, meanwhile, should decline from 1 to 3 feet today to 0 to 2 feet Wednesday, while surf on west shores lowers from 6 to 8 feet today to 5 to 7 feet Wednesday morning.

Surf on east shores is expected to be moderate and choppy, at 3 to 5 feet today, but decline to 2 to 4 feet on Wednesday.

Forecasters expect breezy trades to continue today but trend into the light and moderate range at the end of this work week.

Skies today are mostly sunny, with highs expected to reach up to 90 degreees Fahrenheit.

A small craft advisory also remains in effect for Alenuihaha and Pailolo channels, Maalaea Bay, and leeward and southeast Hawaii island waters, through Wednesday morning.