Light to moderate trades will strengthen through Wednesday. Moisture from the remains of Norbert should move through the islands Wednesday night through Friday morning as trades strengthen to moderate to fresh levels. Drier air will move back in this weekend as trades continue.
Moderate trade winds will continue into Tuesday, then gradually strengthen to become locally breezy Tuesday afternoon into Tuesday night. Moisture along a dissipating surface trough moving over the eastern end of the state this evening will move up the island chain through the day on Tuesday and increase windward cloud and shower coverage as it passes through. MVFR conditions are possible especially over the eastern end of the state where there is greater shower coverage. Otherwise, generally VFR conditions will prevail.
AIRMET Sierra is in effect for tempo mountain obscuration for the Big Island and may be needed through Tuesday morning as showers linger.
Issued at 405 PM HST Mon Sep 14 2026
Moderate to locally fresh trade winds will persist through Tuesday as a weak trough lingers to the northeast. By Wednesday, building high pressure will increase the trade winds into the fresh to locally strong range through the weekend. Also by Wednesday afternoon, the remnants of Norbert will move through as a trough and increase shower coverage over Hawaiian waters.
Small surf along south-facing shores will continue through Tuesday before a series of long-period S to SSW swells are expected to arrive Wednesday through the weekend. The first pulse will gradually fill in tonight into Wednesday out of the southwest, followed by larger south-southwest swells Friday into the weekend. As a result of these swells, surf will gradually trend upward through the week beginning Wednesday and could approach advisory thresholds by the weekend.
Surf along east-facing shores should see an increase during the second half of the week as the trades strengthen and the remnants of Tropical Storm Norbert move through the islands. Flat to tiny surf along north facing shores is expected through the forecast period.
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