http://www.weather.gov/hawaii NWS WFO Honolulu, HI - Offshore Waters Forecast (Hawaii) none en-us W-HFO.Webmaster@noaa.gov (Honolulu Webmaster) W-HFO.Webmaster@noaa.gov (Honolulu Webmaster) 21 Sep 2026 03:30:00 GMT 21 Sep 2026 03:30:00 GMT http://weather.gov/images/xml_logo.gif NOAA and NWS logos 80 41 http://www.weather.gov/hawaii http://forecast.weather.gov/product.php?site=hfo&issuedby=HFO&product=OFF OFFHFO

Offshore Waters Forecast for Hawaii
National Weather Service Honolulu HI
530 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.

PHZ105-211030-
530 PM HST Sun Sep 20 2026

.Synopsis for the Hawaiian offshore waters...
Isolated thunderstorms will be possible over the S waters through
Monday. Another 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.

$$

PHZ180-211030-
Hawaiian Offshore Waters-
530 PM HST Sun Sep 20 2026

.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.

$$
]]> forecast 21 Sep 2026 03:30:00 GMT http://forecast.weather.gov/product.php?site=hfo&issuedby=HFO&product=OFF W-HFO.Webmaster@noaa.gov (Honolulu Webmaster)