Marine Weather and Tide Forecast for Captain Cook, HI

DISCUSSION
Issued at 350 PM HST Tue Apr 14 2026

This afternoon's radar and satellite imagery shows an increase of moderate to locally heavy showers over parts of windward Kauai and central Oahu as a result of the day time sea breeze convergence and lingering moisture over the western half of the state. For tonight, we should generally see showers decrease across the state with land breezes developing over many areas.

For Wednesday and Thursday, trade winds will gradually fill in from east to west across the state with moderate trades expected by Thursday. Although the weather will be cloudy at times due to the upper level trough to our west, lower levels of the atmosphere will be fairly dry with mainly some isolated to scattered showers expected. The one exception is over Kauai, where we could see afternoon showers develop Wednesday afternoon over interior areas.
Drier conditions are expected by Thursday for Kauai.

For Friday into the weekend, we will see an upper level trough digging down into the vicinity of the state from the northwest.
The latest 12Z guidance continues to show the main moisture staying off to the west of the state with a surface low developing this weekend and lifting off to the north on both the GFS and ECMWF models. A subtle shift with the trough further east could change the weekend forecast quite a bit, so at this time the forecast for the weekend still remains uncertain. At the very least, we will likely see an increase of showers due to some low level moisture moving in from the east. Moderate easterly trades on Friday will likely gradually weaken and veer towards the southeast over the weekend especially around Sunday



AVIATION
Issued at 350 PM HST Tue Apr 14 2026

Mostly VFR, but isolated IFR in low clouds persists, especially at PHNY. This should end this evening. There is a chance of showers at PHLI through early evening, with brief MVFR possible, but not expected. Winds will increase slightly overnight and become generally southeast Wednesday. ENE trades should return Thursday.

No AIRMETs in effect.



MARINE
Issued at 350 PM HST Tue Apr 14 2026

Trough to the W persists in maintenance of gentle to locally moderate SE flow. Building high pressure then supports locally fresh trades across the waters into the weekend. A small, short- period, NW swell slowly diminishes into the weekend. A small, medium-period, S swell will boost surf along S shores through late week and subside over the weekend. Surf along E shores remains below the seasonal average as trades remain light. Increasing trades by week's end then brings a slight bump to surf.



HFO WATCHES/WARNINGS/ADVISORIES
None.