Moderate easterly trade winds are expected to continue throughout the week. An upper level trough approaching the islands will deepen into an upper low near Kauai by Tuesday. This upper disturbance will pass by the islands, then linger northeast of the state throughout the week. This will result in increased clouds and showers across the region through the week. Shower activity will favor windward mountain areas in the overnight to early morning hours, with brief periods of showers drifting into leeward areas. Locations sheltered from the moderate easterly trade winds could also see increased clouds and a few showers during the afternoons.
Moderate to locally breezy trade winds will continue during the next couple of days. A few briefly heavy showers can be expected over the next 24 hours or so as an upper level trough moves across the region. AIRMET Sierra is currently in effect for windward Oahu due to degraded cigs under showers, however this may improve during the day tomorrow. Borderline conditions for mountain obscuration may be observed across other islands through the night as well.
Issued at 349 PM HST Mon Apr 27 2026 Moderate to fresh east-northeasterly trades will continue through Tuesday, then strengthen Tuesday night or Wednesday as a weak trough currently traversing the main Hawaiian islands shifts to the west and a ridge builds north of the state. This will likely correspond to Small Craft Advisory winds across the typically windier waters surrounding Maui County and the Big Island beginning by Wednesday.
Surf along exposed north- and west-facing shores eases tonight as a northwest swell fades. However, a small bump in surf is expected through the day on Tuesday with the arrival of a small northwest swell. An upward trend is expected during the second half of the week as another northwest swell arrives. Looking further ahead, a storm-force low east of Japan will send a moderate, longer-period northwest swell toward the islands for Friday and Saturday, with surf heights potentially approaching advisory levels along exposed north and west facing shores.
Surf along south-facing shores will remain small through much of the week, with mainly background south to southwest swell expected. Another south-southwest pulse may arrive by this weekend from recent activity within our swell window east of New Zealand, providing a small increase in surf.
Surf along east-facing shores will remain relatively small and choppy through midweek, with a slight rise possible later in the week as trades strengthen.
None.
