The Offshore Waters Forecast for Hawai`i.

Severe Weather and Heavy Rainfall Potential for the Plains; Coastal Low Across the mid-Atlantic

An upper trough and frontal boundary will focus showers and thunderstorms across portions of the Plains through early Monday; A few severe thunderstorms along with heavy rainfall are expected. Meanwhile, low pressure off the Southeast Coast will bring inclement weather across the mid-Atlantic coast through Monday. This system is forecast to meander off the coast then track inland early this week. Read More >

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FZHW60 PHFO 190316
OFFHFO

Offshore Waters Forecast for Hawaii
National Weather Service Honolulu HI
516 PM HST Thu Sep 18 2025

Hawaiian offshore waters beyond 40 nautical miles out to 240
nautical miles including the portion of the Papahanaumokuakea
Marine National Monument east of French Frigate Shoals

Seas given as significant wave height, which is the average height
of the highest 1/3 of the waves. Individual waves may be more than
twice the significant wave height.

PHZ105-191400-
516 PM HST Thu Sep 18 2025

.Synopsis for the Hawaiian offshore waters...
High pressure will remain anchored N of the state through this
weekend and briefly weaken early next week. Another disturbance
passing N of the state will bring isolated thunderstorms to the NW
waters Friday through Saturday.

$$

PHZ180-191400-
Hawaiian Offshore Waters-
516 PM HST Thu Sep 18 2025

.TONIGHT...E winds 10 to 20 kt. Seas 6 to 7 ft.
.FRIDAY THROUGH SATURDAY NIGHT...NE to E winds 10 to 20 kt. Seas
5 to 7 ft rising to 6 to 8 ft Saturday night. Isolated
thunderstorms NW Half.
.SUNDAY THROUGH TUESDAY...E winds 10 to 20 kt. Seas 6 to 8 ft
subsiding to 5 to 6 ft Tuesday.

$$