An upper level trough passing through the region this morning will maintain some higher level clouds over the islands with scattered showers and the chance for a thunderstorm or two, mainly over the western islands. Lighter winds are expected to spread across the region Tuesday and Wednesday, leading to some afternoon clouds and showers. A ridge builds back in north of the state by Thursday, allowing moderate easterly trade winds with passing windward showers to return lasting through the upcoming weekend.
Light easterlies persist windward areas along with land- sea breezes over leeward and interior regions. Winds will begin to veer more ESE late this afternoon into the evening hours. Light showers possible windward and mauka. Heavier showers likely develop over island interiors during peak heating this afternoon. As the upper-level disturbance and associated surface trough approach the Hawaiian Islands from the west, expect cloud and shower activity to tick upward. VFR prevails, but MVFR within heavier showers.
No AIRMETs are currently in effect.
Issued at 329 AM HST Mon Apr 20 2026
A trough of low pressure passing northwest of the state will act to weaken and veer winds east-southeasterly through mid-week across the local waters. Light wind flow should allow for afternoon sea breeze development near the shores. Isolated thunderstorms are expected to continue over the northwestern waters in the vicinity of the trough through tonight. By Thursday, high pressure ridging builds back in north of the state with fresh northeasterly trade winds returning to the region into next weekend.
Swell and surf will remain small along all shores through late today.
A small, medium-period northwest swell arrives tonight, bringing an uptick in surf along north and west facing shores for Tuesday before peaking on Wednesday. A moderate, medium- period north- northeast swell arrives on Tuesday and peaks also on Wednesday, bringing moderate surf to north and northeast facing shores, before slowly declining through the end of the week.
Another small, long-period west-northwest swell will enter the waters Wednesday night and provide a slight bump up for surf along west and northwest facing shores. Surf will continue to be small along south facing shores through the period. East facing shores will see an increase in surf with the arrival of the aforementioned north-northeasterly swell despite below-seasonal average trades.
None.
