Kahului, Hawaii 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

224
FXHW60 PHFO 281340
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
340 AM HST Sat Jun 28 2025

.SYNOPSIS...
Moderate to locally breezy trade winds will persist today then
weaken and veer out of the east-southeast Sunday into early next
week as a broad, weak trough develops and moves across the area.
The lighter flow may allow for some isolated sea breeze showers
across leeward areas, in addition to the typical windward and
mauka showers. Midweek and beyond, the high to our northeast will
gradually build and bring breezy trades to the area by next
weekend.

&&

.DISCUSSION...
High pressure systems far northwest and northeast of Hawaii will
maintain breezy trade winds today. Incoming low clouds and showers
will focus across windward Kauai and Big Island this morning,
likely decreasing over these areas around midday. Mostly dry
conditions will persist across the rest of the state, but any
clouds and showers that do move in will impact windward areas.
Cirrus clouds filled in last night, but expecting these to move
off to the east this morning. Leeward clouds from the daytime sea
breezes will impact the Kona slopes on the Big Island this
afternoon.

Sunday into Monday, a board low level trough will develop over
the islands as the high pressure systems become separated by front
in the North Central Pacific. Winds will weaken and veer east
southeasterly and guidance depicts an uptick in clouds and showers
tracking in from the southeast. The instability provided by this
weak troughing over/near the state combined with pockets of
moisture moving in on the trades may be enough to enhance windward
and mauka showers during the overnight hours with some spillage
over into interior and leeward areas, and to help some clouds and
showers build over island interiors and leeward areas in the
afternoons where any sea breezes manage to develop in the lighter
flow. A typical summertime upper trough near the state and above
the low/midlevel trade wind inversion may contribute to some
shower enhancement before the surface trough and associated moisture
clears the islands to the west Monday night.

Winds will remain lighter into Tuesday. The trades will build in
Wednesday with a band of moisture from an old front that will
track in from the east Wednesday night and Thursday. Then heading
into next weekend, the surface high to our northeast will build,
strengthening the local pressure gradient and bringing breezy
easterly trades across the island chain. Overall, typical trade
wind weather can be expected through the second half of the week
with periods of windward and mauka showers.

&&

.AVIATION...
Breezy and stable trade wind weather will continue today. Brief
MVFR ceilings and visibility possible with incoming windward
showers. AIRMET Sierra is in effect for tempo mountain
obscurationsfor windward sides of Kauai and the Big Island above
2500 feet likely continuing through the morning. Mostly dry and
VFR conditions are expected elsewhere today. AIRMET Tango remains
in effect for low-level lee turbulence caused by the breezy and
stable trade winds.

&&

.MARINE...
Moderate to locally breezy trades are expected through at least
Saturday as high pressure remains in place far northeast of the
islands. A Small Craft Advisory has been extended for the typical
windier waters and channels around Maui and the Big Island
through Sunday 6AM. Early next week, a disturbance passing to the
north of the islands may weaken the trades a bit as they veer to
become slightly east-southeast.

A tiny long-period reinforcement south swell should arrive this
morning. Guidance remains in good agreement that a small, long-
period south swell will arrive late Sunday into Monday. This swell
is expected to boost south shore surf up to near the summertime
average, peaking on Monday and then declining through much of next
week.

Surf along east shores will remain rough and choppy for the next
couple of days due to the locally breezy trades. Surf along north
facing shores will remain tiny throughout the next week.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 AM HST Sunday for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.


&&

$$


DISCUSSION/AVIATION...Foster
MARINE...Walsh