Boise, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

946
FXUS65 KBOI 160013
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
613 PM MDT Fri May 15 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Cool and breezy this weekend, temperatures 10 to 15 degrees
  below normal.

- Mountain rain and snow showers Saturday night and Sunday with
  light snow accumulations at higher elevations.

- Patchy frost possible Sunday and Monday morning mainly east of
  Mountain Home.

&&

.SHORT TERM /Through Sunday Night/...
Issued 232 PM MDT FRI MAY 15 2026
A shortwave trough moving into the Pac NW this afternoon, will
push a dry cold front across the region overnight. The frontal
passage will be marked with an uptick in wind speed/gusts
especially across open terrain of SE Oregon and the Snake Plain.
Gusts will range 20-35 mph with the frontal passage and stay
elevated behind the front on Saturday. Showers will develop
across the mountains in Baker County and w-central Idaho on
Saturday as the upper low center tracks into northern ID. The
cold air aloft will support a slight chance of afternoon
thunderstorms in the mtns as well. Snow levels drop to between
4500-5500 feet, but any notable accumulation (up to 2") would
be above 6500 feet in the Wallowas, and north of McCall/Yellow
Pine. Lower and drier locations could see blowing dust Saturday
and Sunday, as gusts reach 30 to 45 mph, mostly during the
afternoons. A tailing shortwave trough will drop through central
Oregon Saturday night and into the northern Great Basin on
Sunday. This system will bring a 20-40% chance of light showers
to SE Oregon and the SW Idaho highlands south of the Snake
Plain. It will also reinforce the cooler air mass while keeping
winds elevated. Temperatures will remain 10-15 degrees below
normal through the weekend. A frost/freeze threat will be
present Saturday night from the Mountain Home area to
Twin/Jerome. Winds will be a foil in allowing for temperatures
to reach freezing and the formation of frost. The coldest areas
have forecast lows in the 33-37 degree range.

&&

.LONG TERM /Monday through Friday/...
Issued 232 PM MDT FRI MAY 15 2026
As the trough moves east and high pressure builds in over the
west coast, a gradual warming trend begins. Before the trend
begins, however, Monday morning will be the coldest in the
forecast, with lows below 32 degrees above 4000 ft, and between
36-32 degrees above 3000 ft. This will put some of our growing
zones, including the Magic Valley and upper Snake Plain, into
freeze and frost territory. Temperatures overall rise from 5-10
degrees below normal Monday, to near normal by Wednesday, and
5-10 degrees above normal by Friday. Dry conditions prevail
overall as afternoon minimum relative humidities reach 10-30%.
Modest breezes each afternoon, especially in traditionally windy
areas, with wind gusts up to 20 mph each day. There is a
chance, though low 5-10% of showers and thunderstorms next
Friday afternoon. Models carry a weak trough through North Idaho
that may impact our area.

&&

.AVIATION /00Z Saturday through Sunday/...
Issued 613 PM MDT FRI MAY 15 2026

VFR. Cold front arriving late tonight. Increasing NW winds and
scattered rain/snow showers north of KBNO-KONO-KSUN overnight
through Saturday. Snow levels 5.5-7kft MSL tonight, lowering to
4.5-6kft by mid-morning. Local MVFR/IFR in showers with mtn
obscuration. Surface winds: W-NW 5-15 kt with 20-25 kt gusts.
Behind the front Saturday, NW 10-25 kt winds with 25-40 kt
gusts. Winds aloft at 10kft MSL: W 15-30 kt.

KBOI...VFR. Cold frontal passage around 16/07z, bringing
increased NW winds and mid-level ceilings. Surface winds: NW
5-15 kt this eve, then briefly NE-SE around 5 kt after sunset.
Returning to NW with cold front, 10-20 kt with gusts to 25-30 kt
Saturday.

Sunday Outlook: Rain/snow showers expanding southward Sat night
through mid-day Sunday, favoring SE Oregon, ID-NV border, and
central ID mtns. Periods of IFR-LIFR and in mountain snow/low
ceilings. Mtns obscured. Snow levels drop to 3-5kft MSL by early
Sunday AM. Surface winds: NW 10-25 kt with gusts 25-40 kt.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.

OR...None.

&&

$$

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AVIATION.....SH
SHORT TERM...DG
LONG TERM....JM