FZHW60 PHFO 210957

OFFHFO



Offshore Waters Forecast for Hawaii

National Weather Service Honolulu HI

1157 PM HST Sun Sep 20 2026



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.



PHZ105-211615-

1157 PM HST Sun Sep 20 2026



.Synopsis for the Hawaiian offshore waters...

A trough, which may develop into a tropical cyclone, will 

approach from the E on Tuesday and bring renewed thunderstorm 

potential through Friday. Fresh to strong trades continue through 

most of the week before strengthening heading into the weekend. 



$$



PHZ180-211615-

Hawaiian Offshore Waters-

1157 PM HST Sun Sep 20 2026



.REST OF TONIGHT...E winds 15 to 25 kt. Seas 7 to 9 ft. Isolated 

thunderstorms S of 19N. 

.MONDAY...E winds 15 to 25 kt. Seas 7 to 9 ft. Isolated

thunderstorms S of 18N. 

.MONDAY NIGHT...E winds 10 to 20 kt N of 24N, E 15 to 25 kt

elsewhere. Seas 7 to 9 ft. Isolated thunderstorms S of 18N.

.TUESDAY THROUGH WEDNESDAY...NE winds 15 to 25 kt. Seas 6 to 11 

ft, highest over SE waters. Isolated thunderstorms SE Waters.

.THURSDAY...NE winds 15 to 25 kt. Seas 6 to 9 ft. Isolated

thunderstorms SE Waters. 

.FRIDAY...E winds 20 to 30 kt. Seas 7 to 10 ft. Isolated

thunderstorms SE Waters. 



$$