textproduct: Honolulu

SYNOPSIS

Trade wind showers expected in the usual windward and mauka areas through tonight. Weaker trade winds expected Wednesday through Friday, increasing potential for showers on the leeward side of the islands. Trade winds strengthen and precipitation chances increase over the weekend and early next week.

DISCUSSION

The return of the trade winds will bring areas of showers over windward and mauka locations through tonight. Trades weaken Wednesday through Friday as a trough passes northeast of the islands. Lighter trades will increase precipitation chances for leeward areas with the development of a sea/land breeze pattern.

The winds are expected to strengthen and shift easterly late Friday into Saturday, which will pull additional moisture into the area. This will increase precipitation chances for early in the weekend. Highest chances will be on the windward and mauka parts of the islands.

For Sunday and Monday, tropical moisture is expected to be in the vicinity of the state due to the potential development of a tropical system. Most guidance keeps the track of the potential tropical system south of the islands. While there remains uncertainty in the forecast since the system has yet to develop, precipitation chances have been increased for early next week. Please continue to monitor the forecast as it is subject to change as we get closer to the weekend and details surrounding the forecast become clearer.

AVIATION

Moderate trade winds will maintain through Wednesday. VFR conditions will prevail tonight with brief mountain obscurations and scattered showers windward.

No AIRMETs are currently in effect or expected tonight.

MARINE

High pressure far northeast of the waters will remain nearly stationary and slowly weaken for the next couple of days. Trade winds will continue a weakening trend, becoming light and variable for most waters by Thursday as daytime sea breezes and overnight land breezes become established. By late Friday, moderate to locally fresh trades will begin to build back into the region as the high drifts southward closer to the island chain.

PacIOOS buoy Barber's Point has slowly have dropped over the past 24 hours to around 2 feet of swell at 13 seconds as of this afternoon. Surf along south facing shores will continue declining through midweek as south swell fades. Another long period south swell generated from gales just south and east of New Zealand will begin arriving late this week. Surf along east facing shores will also continue to fade as background flow becomes weaker. North facing shores will remain tiny throughout the week.

FIRE WEATHER

Issued at 340 PM HST Tue Aug 18 2026

Moderate trade winds will prevail through tonight. Trade winds will weaken Wednesday through Friday, increasing chances of showers for the leeward side of the islands. Trade winds increase over the weekend into early next week with increased chances of precipitation. The inversion is 6000 to 7000 ft.

HFO WATCHES/WARNINGS/ADVISORIES

None.