Swell Matrix

Area Forecast Discussion

National Weather Service Honolulu Hi

841 pm hst Sat Jun 20 2026

Synopsis

Light to moderate east-southeasterly winds will persist this evening, then take on an east northeasterly component by Sunday. Despite the slight variation in wind direction, the light to moderate background flow will bring a combination of limited windward and mauka showers along with isolated sea breeze induced leeward and interior showers. Then easterly trade winds will strengthen to moderate to breezy levels by midweek with an uptick in windward and mauka showers expected.

Aviation

Light to moderate easterly trades will persist through Monday, with clouds and a few showers favoring windward and mauka locations overnight through the early morning hours. Expect some cloud buildups over leeward and interior sections through the afternoon hours where localized sea breezes form. No AIRMETs are anticipated through the period, with VFR conditions prevailing.

Marine

Issued at 328 PM HST Sat Jun 20 2026 Little change to the forecast this afternoon.

A ridge remains northeast of the islands, and a trough to the northwest. The trough is expected to move slowly to the east. This will maintain the light to moderate trade winds through the remainder of the weekend. As the trough moves east and dissipates on Monday, the trade winds will increase. The ridge will strengthen through the week, allowing trade winds to increase.

A small, medium-period south swell will continue to fade, with a new long-period south swell peaking overnight. The result surf along south and west-facing shores should begin to diminish Sunday. Additional medium to long period south and southeast swells are expected through the middle of next week, which will maintain surf heights near seasonal averages.

Tiny surf will prevail along north-facing shores through most of the coming week as limited short-period energy reaches the islands from the north and northwest. As the trade winds increase next week, expect the surf along east facing shores to trend upwards.

Watches, Warnings, Advisories

None.

Visit this site often? Consider supporting us with a $10 contribution.
Learn more