FZHW50 PHFO 190107 CWFHFO Coastal Waters Forecast National Weather Service Honolulu HI 307 PM HST Sun Oct 18 2026 Hawaiian coastal waters within 40 nautical miles including the Hawaiian Islands Humpback Whale National Marine Sanctuary. 307 PM HST Sun Oct 18 2026 .Synopsis for Hawaiian coastal waters... Robust surface high pressure centered far north of Hawaii will maintain fresh to strong trade winds into Tuesday. Trades will steadily decrease late Tuesday and Wednesday as the high weakens and moves eastward. Trade winds will lower to gentle strength, or may become disrupted, as a low passes to the north Thursday and Friday.
Big Island Windward Waters- 307 PM HST Sun Oct 18 2026
TONIGHT
East northeast winds 20 to 25 knots, easing to 15 to 20 knots after midnight. Seas 6 to 7 feet. Wave Detail: East 6 feet at 6 seconds and north 3 feet at 12 seconds. Numerous showers, mainly this evening.
MONDAY
East northeast winds 15 to 20 knots. Seas 5 to 7 feet. Wave Detail: East 6 feet at 7 seconds and north 3 feet at 11 seconds. Scattered showers.
MONDAY NIGHT
East northeast winds 15 to 20 knots. Seas 5 to 6 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers.
TUESDAY
East northeast winds 15 to 20 knots. Seas 5 to 6 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers.
TUESDAY NIGHT
East northeast winds 15 to 20 knots. Seas 5 to 6 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers.
WEDNESDAY
East winds to 15 knots. Seas 5 to 6 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers.
WEDNESDAY NIGHT
East winds to 15 knots. Seas 4 to 5 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers.
THURSDAY
East winds 10 to 15 knots. Seas 4 to 6 feet. Wave Detail: East 4 feet at 13 seconds. Scattered showers.
FRIDAY
East northeast winds 10 to 15 knots. Seas 5 to 6 feet. Wave Detail: East 4 feet at 12 seconds, north northwest 3 feet at 10 seconds and south southwest 3 feet at 14 seconds. Scattered showers.
Big Island Leeward Waters- 307 PM HST Sun Oct 18 2026
...SMALL CRAFT ADVISORY IN EFFECT THROUGH EARLY TUESDAY MORNING...
TONIGHT
West of the Big Island, southwest winds 7 to 10 knots, veering to northwest after midnight. Near South Point, east northeast winds to 25 knots. Seas 5 to 7 feet. Wave Detail: East northeast 6 feet at 7 seconds. Isolated showers.
MONDAY
West of the Big Island, winds variable less than 10 knots, becoming west 7 to 10 knots in the afternoon. Near South Point, east winds 20 to 25 knots. Seas 5 to 7 feet. Wave Detail: East northeast 6 feet at 6 seconds.
MONDAY NIGHT
West of the Big Island, south southwest winds 7 to 10 knots in the evening, becoming variable less than 10 knots. Near South Point, east northeast winds 20 to 25 knots. Seas 4 to 6 feet. Wave Detail: East northeast 5 feet at 6 seconds.
TUESDAY
Winds variable less than 10 knots west of the Big Island...East 20 to 25 knots near South Point. Seas 4 to 6 feet. Wave Detail: East northeast 5 feet at 6 seconds.
TUESDAY NIGHT
Winds variable less than 10 knots west of the Big Island...East northeast 20 to 25 knots near South Point. Seas 4 to 6 feet. Wave Detail: East northeast 5 feet at 6 seconds. Isolated showers.
WEDNESDAY
Winds variable less than 10 knots west of the Big Island...East 15 to 20 knots near South Point. Seas 4 to 6 feet. Wave Detail: East northeast 5 feet at 6 seconds.
WEDNESDAY NIGHT
Winds variable less than 10 knots west of the Big Island...East northeast 15 to 20 knots near South Point. Seas 3 to 5 feet. Wave Detail: East 4 feet at 5 seconds.
THURSDAY
Winds variable less than 10 knots west of the Big Island...East northeast 10 to 15 knots near South Point. Seas 3 to 5 feet. Wave Detail: East 4 feet at 5 seconds.
FRIDAY
Winds variable less than 10 knots west of the Big Island...East northeast 10 to 15 knots near South Point. Seas 3 to 5 feet. Wave Detail: East 3 feet at 4 seconds. Isolated showers.
Big Island Southeast Waters- 307 PM HST Sun Oct 18 2026
...SMALL CRAFT ADVISORY IN EFFECT THROUGH EARLY TUESDAY MORNING...
TONIGHT
East northeast winds 20 to 25 knots. Seas 7 to 8 feet. Wave Detail: East 8 feet at 6 seconds. Numerous showers.
MONDAY
East northeast winds 20 to 25 knots. Seas 6 to 8 feet. Wave Detail: East 8 feet at 7 seconds. Scattered showers, mainly in the morning.
MONDAY NIGHT
East northeast winds 20 to 25 knots. Seas 6 to 8 feet. Wave Detail: East 8 feet at 7 seconds. Scattered showers.
TUESDAY
East northeast winds to 25 knots. Seas 6 to 8 feet. Wave Detail: East 8 feet at 7 seconds. Scattered showers.
TUESDAY NIGHT
East northeast winds 20 to 25 knots. Seas 6 to 8 feet. Wave Detail: East 8 feet at 7 seconds. Scattered showers.
WEDNESDAY
East northeast winds to 20 knots. Seas 5 to 8 feet. Wave Detail: East 8 feet at 7 seconds. Scattered showers.
WEDNESDAY NIGHT
East northeast winds 15 to 20 knots. Seas 5 to 7 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers.
THURSDAY
East northeast winds 15 to 20 knots. Seas 5 to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers.
FRIDAY
East northeast winds to 15 knots. Seas 5 to 6 feet. Wave Detail: East 4 feet at 12 seconds and south southwest 3 feet at 14 seconds. Scattered showers.
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