FZHW51 PHFO 220123 CWFHI1 Generalized Statewide Coastal Waters Forecast for Hawaii National Weather Service Honolulu HI 323 PM HST Sat Mar 21 2026 .Synopsis for Hawaiian coastal waters... A surface low is located north of the islands with a pair of troughs draped over the region. Bands of heavy showers and thunderstorms will continue to move over the coastal waters into Sunday. The low will lift northeast of the region on Sunday, and strong high pressure will build far north of the islands Monday and Tuesday. $$ Hawaiian waters within 40 nautical miles including the channels- ...SMALL CRAFT ADVISORY... .TONIGHT...South southwest winds 10 to 15 knots. Seas 7 to 10 feet. Wave Detail: North northeast 6 feet at 11 seconds, south 4 feet at 5 seconds and northwest 3 feet at 15 seconds. Occasional heavy showers with a slight chance of thunderstorms. .SUNDAY...Southwest winds 7 to 10 knots. Seas 6 to 9 feet. Wave Detail: North northeast 5 feet at 10 seconds and northwest 3 feet at 14 seconds. Occasional heavy showers with a slight chance of thunderstorms. .SUNDAY NIGHT...East northeast winds 10 to 15 knots. Seas 5 to 8 feet. Wave Detail: North northeast 4 feet at 10 seconds and northwest 3 feet at 13 seconds. Heavy showers likely with a slight chance of thunderstorms. .MONDAY...Northeast winds 20 to 25 knots near Kauai and Oahu... east northeast 10 to 15 knots elsewhere. Seas 5 to 7 feet. Wave Detail: East northeast 4 feet at 5 seconds, north northeast 4 feet at 9 seconds and northwest 3 feet at 12 seconds. Scattered showers. .MONDAY NIGHT...East northeast winds 20 to 25 knots. Seas 5 to 8 feet. Scattered showers. .TUESDAY...East northeast winds 15 to 20 knots. Seas 6 to 8 feet. Scattered showers. .TUESDAY NIGHT...East northeast winds 20 to 25 knots. Seas 7 to 9 feet. Scattered showers. .WEDNESDAY...Northeast winds 20 to 25 knots. Seas 7 to 9 feet. Scattered showers. .THURSDAY...Northeast winds 15 to 20 knots, rising to 20 to 25 knots. Seas 6 to 8 feet. Isolated showers. Winds and seas higher in and near tstms. $$