Hilo, Hawaii 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

637
FXHW60 PHFO 090158
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
358 PM HST Tue Jul 8 2025

.SYNOPSIS...
A strong high pressure ridge north of the Hawaiian Islands will
continue to produce breezy to windy trade winds through this
evening, with the strongest winds focused across Maui County and
the Big Island. Dry weather conditions will combine with these
strong gusty winds to keep elevated fire danger across the state
through this evening, mainly over the drier leeward slopes. Winds
will ease starting Wednesday, with a ridge aloft confining brief
passing showers to mainly windward and mountain areas.

&&

.DISCUSSION...
Strong high pressure north of the Hawaiian Islands will maintain
breezy to windy easterly trade winds across the state. A Wind
Advisory remains in effect through this evening for the windier
areas of Maui and Hawaii Counties; including the summits of Mauna
Kea and Mauna Loa on the Big Island. Given the latest trends and
model guidance will likely let the Wind Advisory expire at 6 PM
this evening, but would not be surprised to see isolated advisory
gusts continue into tonight.

In addition, the relatively dry humidity levels will combine with
the strong winds to keep elevated fire weather conditions across
the state, mainly over drier and windier leeward areas. Please
refer to the Fire Weather section below for more details.

Satellite imagery this afternoon continue to show bands of fairly
stable clouds moving into windward and mauka areas, with radar
imagery showing light passing showers moving across the islands.
The ridge aloft continue to keep inversion heights around 5,000 to
6,000 feet this afternoon based on soundings at Hilo and Lihue.

The pattern will begin to change tonight into Wednesday as high
pressure north of the state weakens. This will allow our strong
winds to gradually weaken overnight, with moderate to breezy
trades expected for the rest of the week. As the high weakens will
also see the inversion lift back to around 7,000 to 8,000 feet.
This will allow clouds to grow higher, with a return towards
typical summer time trade wind weather expected. An upper level
low just southwest of the islands will help to enhance sunrise and
sunsets as cirrus clouds stream across the region.

&&

.AVIATION...
Strong and gusty trades continue through this afternoon and then
ease on Wednesday. High stability favors continued scattered light
showers with a high coverage of overnight cloud cover windward
and mauka where the occasional MVFR condition will be possible.
Otherwise, VFR prevails.

AIRMET Tango remains for lee turb remains in effect.

&&

.MARINE...
High pressure far northeast of the islands will support fresh to
strong trades across the area. A Small Craft Advisory (SCA) is now
in effect for all Hawaiian coastal waters through 6 AM HST Wednesday.
The surface high will move eastward and weaken slightly during the
second half of the week, but winds are likely to remain breezy to
locally strong in the windier channels and waters of Maui County
and the Big Island through the rest of the week.

A small mid-period south swell will continue through Thursday. A
slight boost to the period expected on Saturday. Another small, long-
period swell expected next Sunday night into Monday. Surf along south
facing shores will boost along with the arrival of the mentioned
swells. Surf along east-facing shores will be rough and choppy due to
the breezy trade winds that will persist the rest of the week.

&&

.FIRE WEATHER...
Breezy to windy trade winds with stable and relatively dry
conditions will continue through this evening. Minimum relative
humidity at lower leeward elevations were around 45 percent this
afternoon. The inversion this afternoon was around 5,000 ft. Near
critical fire weather conditions over dry leeward areas will
continue through this evening, but no headlines (watches or
warnings) are expected since the Keetch Byram Drought Index will
remain below the 600 threshold at Honolulu.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
Wind Advisory until 6 PM HST this evening for Lanai Mauka-
Kahoolawe-Maui Windward West-Maui Leeward West-Kohala-Big Island
Summits-Molokai-Lanai Windward-Lanai Leeward-Lanai South-Maui
Central Valley North-Maui Central Valley South-Windward
Haleakala-South Haleakala-Big Island South-Big Island Southeast-
Big Island North.

Small Craft Advisory until 6 AM HST Wednesday for all Hawaiian
waters-

&&

$$


DISCUSSION...Ahue
AVIATION...JVC
MARINE...Foster
FIRE WEATHER...Ahue