A light land and sea breeze pattern will produce afternoon clouds and spotty showers over land and partial clearing at night. Trade winds will redevelop late Wednesday and strengthen Thursday and Friday focusing rainfall over windward and mauka areas.
Land breezes will clear out clouds and showers tonight, bringing mostly clear conditions to the airports. Tomorrow morning and afternoon will see sea breezes and associated cloud and shower buildups over interior areas before northeasterly trade winds fill in by the evening. Once the trade winds return, showers will return to focusing over windward and mountain areas. VFR conditions will prevail with brief MVFR conditions any in showers
No AIRMETs in effect.
Issued at 321 PM HST Tue Apr 21 2026
A weak low north of the area will continue to drift eastward and further away from the state over the next few days. As the low drifts further east, a ridge of high pressure will fill in north of the state, which should bring the return of moderate trade winds by Wednesday evening. Light winds during the night tonight and day time Wednesday will lead to land and sea breeze development near the coastlines. By Thursday evening, we should see moderate to fresh trade winds and by the weekend, we could see moderate to locally strong trade winds as another high builds north of the state.
A small, medium-period, west-northwest to northwest (300-330) swell continues to fill in this afternoon and will likely peak tonight, then gradually decline over the next few days. Another smaller reinforcing swell will also fill in tonight into Wednesday.
A moderate, medium-period north-northeast swell also started filling in today and will likely peak on Wednesday near advisory thresholds for east facing shores. This swell will produce above average surf for select north and east facing shores on Wednesday, before slowly declining through the end of the week. Strengthening trades late this week will support closer to seasonal average surf for east facing shores into the weekend.
As the former Super Typhoon Sinlaku made its extra tropical transition last weekend, it gradually traveled eastward along our great circle route. Although the former typhoon was relatively compact, altimeter did show some higher seas of 14 to 18 feet far west of the state a few days ago. This could bring some west swell along select exposures starting today through the next several days. Peak energy from the former Typhoon is expected Wednesday or Thursday and could wrap into select southwest facing exposures. Otherwise a small southwest swell from the Tasman Sea should arrive this weekend.
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