Haiku-Pauwela, Hawaii 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

666
FXHW60 PHFO 291401
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
401 AM HST Sun Jun 29 2025

.SYNOPSIS...
Trades will ease and veer slightly east southeast into early
next week as a broad and weak surface trough sets up over Hawaii.
Incoming clouds and showers will focus windward mostly overnight,
with localized sea breezes bringing chances for rain leeward today.
Trades shift back easterly around Tuesday and continue through
the rest of the week.

&&

.DISCUSSION...
High pressure far northeast of Hawaii will maintain moderate
trade wind flow, however, a broad low level trough over the
western end of the state will veer the wind direction at a
modified east southeast over the next couple days until the
feature weakens and slides westward. Wind direction and speed will
be further influenced by local terrain and upstream blockage from
the Big Island allowing sea breezes to set up in some areas this
afternoon.

In addition to the wind shift, instability provided by this weak
troughing near the state combined with pockets of moisture moving
in on the trades may be enough to enhance the incoming showers.
These showers will focus windward and mauka showers during the
overnight hours and early morning hours the next couple days,
including this morning where radar currently shows scattered
showers across the island chain. Clouds and showers are forecast
to fill in over island interiors and leeward areas in the
this afternoon, and Monday and possibly Tuesday afternoons, where
any sea breezes manage to develop in the lighter wind flow. Any
significant uptick in shower coverage or intensity will be
stifled by a midlevel inversion at around 8000 feet.

By midweek, the low level flow will back out of the east and
strengthen to moderate to locally breezy levels, with pockets of
moisture riding in on the trades. Heading into next weekend, the
surface high to our northeast will gradually 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...
AIRMET Sierra posted for tempo mountain obscurations above 2500
feet for windward sides of Kauai, Oahu, Molokai, Maui and Big
Island due to abundant incoming low clouds and showers impacting
windward slopes of these islands. Expect these showers to decrease
through the morning with possibility of scaling back AIRMET
Sierra. However, clouds and showers are expected to fill in over
leeward and interior sides of the islands due to sea breeze
convergence. Brief mountain obscurations will be likely through
the day, and will monitor for more extensive coverage in these
areas through the day to determine if AIRMET Sierra will need to
be issued for leeward areas as well. No other AIRMETs are expected
today.


&&

.MARINE...
Moderate to locally breezy trades are expected to gradually
decrease through Monday as the ridge to our north weakens due to
a pair of troughs developing far north and northwest of the state.
Early this week, with the pair of aforementioned troughs, trades
should veer slightly toward the east-southeast and weaken to
gentle to moderate speeds. Moderate to fresh trades could return
as early as Tuesday as the troughs move away from the area and a
high builds far north of the state.

Surf along south facing shores should see a small, long-period
south swell slowly fill in today into Monday with surf peaking
near or slightly above the summertime average. This swell will
then gradually decline through the rest of the week.

Surf along east shores will gradually decline over the next
several days due to the trade winds weakening. Surf along north
facing shores will remain tiny throughout next week.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$


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