An upper level trough passing through the Hawaii region on Monday will keep high and middle level clouds over the islands with brief showers and chances for a few thunderstorms. A series of low pressure systems developing northwest to north of the islands will weaken the ridge north of the state, producing weak southeasterly wind flow through Wednesday. The ridge builds back in north of the state by Thursday, allowing moderate easterly trade winds to return lasting through the upcoming weekend.
Issued at 509 PM HST Sun Apr 19 2026 A light easterly background trade wind flow remains over the state today. The light winds have allowed some land and sea breezes to develop over terrain sheltered areas. Expect these winds to remain light and veer more ESE starting tomorrow. Showers remain possible for windward and mountain areas, and over island interiors during afternoon hours through tomorrow. An upper level disturbance moving eastward through the state combined with the light winds at the surface could increase afternoon shower coverage statewide tomorrow. MVFR conditions should be expected within showers, and IFR conditions are possible within heavier isolated downpours. VFR will occur elsewhere.
No AIRMETs are currently in effect.
Issued at 509 PM HST Sun Apr 19 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 flow should allow for afternoon sea breeze development near the shores. As conditions become increasingly unstable aloft, isolated thunderstorms will be possible tonight into Monday over the waters surrounding Kauai and Oahu. By Thursday, high pressure ridging builds back in north of the state with fresh northeasterly trade winds returning to the region lasting through next weekend.
Swell and surf will remain small along all shores through late Monday.
A small, medium period, northwest swell will move across the waters Monday night and continue through Wednesday. 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. A moderate, medium to long period, northeast swell arrives on Tuesday and peaks on Wednesday, bringing moderate surf to north- facing shores, before slowly declining through the end of the week.
Surf will remain small along south facing shores through the period. Surf heights along east facing shores also remain small due to weaker trade winds until the arrival of the aforementioned moderate, medium to long period, northeast swell building into the Hawaii region from Tuesday through Thursday.
None.
