Boise, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

293
FXUS65 KBOI 282014
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
214 PM MDT Sun Jun 28 2026

.KEY MESSAGES...
- Showers and isolated thunderstorms are expected this
  afternoon and evening across southwest Idaho.

- Precipitation will persist across the West Central mountains
  through Monday, with another round of showers returning
  Tuesday afternoon.

- Warmer and drier conditions Tuesday through Thursday.

&&

.SHORT TERM /Through Tuesday Night/...
Scattered showers and isolated thunderstorms will continue this
afternoon and evening, with the main focus across southwest
Idaho as moisture moves in from the north on the backside of the
upper level low. The greatest chance for thunderstorm activity
will be over the higher terrain south of the Snake River Plain
during peak afternoon and evening heating before tapering off
tonight. There is a 30% chance for these light rain showers to
reach the Treasure and Magic Valleys tonight through Monday
morning, though rainfall looks to be minimal. Showers will
continue across the West Central mountains through Monday,
finally coming to an end Monday night as the parent low moves
east into the northern plains. The central mountains will see
additional precipitation totals between 0.25 and 0.75 inches
through Monday. Areas above 7500 feet could see an additional 1
to 3 inches of snowfall tonight.

A broad upper level trough remains over the area on Tuesday.
This persistent large-scale pattern will allow a weak shortwave
passage to cross the region, triggering another round of showers
across the west central mountains. Temperatures will remain
well below normal, tracking roughly 10 to 15 degrees below
seasonal averages through the short term period under the
influence of the trough.

&&

.LONG TERM /Wednesday through Sunday/...
Troughing over the region will support isolated showers and
thunderstorms across the higher terrain of SW Idaho, and cooler
than normal conditions through the end of the week. Most
guidance shows this trough deepening just to our west throughout
the week. With flow taking on more of a southwesterly
compenent, temperatures will steadily warm. As of now it appears
that this warming trend will be more gradual in eastern Oregon.
Come Friday, the trough finally looks to progress east of our
area, this will temporarily hinder the warming trend on Friday,
before a building ridge behind the trough brings temperatures
back up to near normal. The timely exit of this trough will make
way for a pleasant Forth of July, with near normal temperatures
and dry conditions. The pattern evolution becomes more
uncertain to end the period, although the Grand Ensemble favors
continued ridging...and therefore continued warm and dry
conditions.

&&

.AVIATION /18Z Sunday through Monday/...
Issued 1148 AM MDT SUN JUN 28 2026

Generally VFR. Isolated to scattered showers continuing through
the period, mainly in the W-Central ID Mtns. MVFR/IFR
conditions possible in mtn showers. Mtns obscured. Isolated
lightning this afternoon near the ID/NV border and in the
W-Central ID Mtns. Surface winds: W-NW 10-20 kt with gusts to
20-30 kt this afternoon. Then variable 5-10 kt overnight, except
W-SW 10-15 kt near KJER/KTWF. Winds aloft at 10kft MSL: NW 5-15
kt.

KBOI...VFR. Isolated showers this afternoon and evening. Most
likely time of rain at terminal between Mon/00-06z. Foothills
obscured. Surface winds: NW 10-15 kt with gusts to around 20 kt
this afternoon. Then variable (leaning S-SE) under 8 kt
overnight.

&&

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

OR...None.

&&

$$

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SHORT TERM...JDS
LONG TERM....NF
AVIATION.....NF