Boise, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

759
FXUS65 KBOI 202028
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
228 PM MDT Fri Jun 20 2025

.SHORT TERM...Tonight through Sunday night...Winds will continue
to ramp up through this afternoon as a cold front moves through
the region. Winds gusting to 45 mph are expected in s-central
Idaho through this evening, including the Western Magic Valley
(Twin Falls, Jerome) south to the Nevada border. A Wind Advisory
remains in effect until 9 pm MDT. The winds will subside late
this evening and will remain gusty area-wide through the
weekend, but not as strong as today.

An anomalous upper low will support showers through the
weekend, especially over the higher terrain. Snow levels lower
to to around 6000 feet with a chance of light snow accumulations
(up to 3 inches) on the peaks. In addition to the showers,
marginal instability will lead to isolated thunderstorms,
accompanied by gusty winds and small hail. The upper low is
expected to move east of the area Sunday evening, ending the
showers.

Temperatures remain well below normal through the weekend, with
highs averaging 10 to 20 degrees below normal. The coolest day
is expected to be on Saturday.

.LONG TERM...Monday through Friday...An upper trough lingers
early in the week, but not enough moisture to support convection.
The trough weakens by midweek resulting in a warming trend as
temperatures return to above normal by Wednesday. Most of the
ensembles show another trough later in the week, but still not
enough moisture for convection. Bottom line: dry with less than
a 15 percent chance of showers next week with below normal
temperatures on Monday warming to above normal Wednesday through
Friday.

&&

.AVIATION...VFR. Cold front near KSMN through KBOI into
southern OR, shifting east. Rain showers along and behind the
front, locally obscuring mountains. Isolated thunderstorms in
the central ID mountains until 21/06Z. Surface winds: W-NW
15-25kt with gusts 30-40kt along and behind the cold front over
open terrain. Winds aloft at 10kft MSL: W-SW near 30kt.

KBOI...VFR. 30-40% chance of rain showers, greatest chance from
21/00Z to 21/03Z. Less than 10% chance of thunderstorms.
Surface wind NW 15-25kt until 21/06Z, then NW 10-15kt.

KMYL...VFR. Periods of MVFR and mountain obscuration in rain
showers and thunderstorms. Greatest chance of showers (70-80%)
and greatest chance of thunderstorms (15-25%) from 21/00z to
21/03Z. Surface winds: SW 10-15kt with gusts to 25kt until
21/02Z, then variable less than 6kt.

WEEKEND OUTLOOK...VFR. Numerous showers/isolated thunderstorms
obscuring mountains in Baker County/OR and ID north of the Snake
Basin. Areas of MVFR in clouds and pcpn. Snow as low as 6000
feet MSL late Saturday night and early Sunday morning.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Wind Advisory until 9 PM MDT this evening IDZ016-030.
OR...None.

&&

$$

www.weather.gov/Boise

Interact with us via social media:
www.facebook.com/NWSBoise
www.x.com/NWSBoise

SHORT TERM...BW
LONG TERM....LC
AVIATION.....LC