Boise, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

711
FXUS65 KBOI 260608
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
1208 AM MDT Tue May 26 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Gusty winds today, resulting in critical fire weather
  conditions in southeastern Oregon.

- Scattered showers/thunderstorms in Idaho today with outflow
  gusts as strong as 60 mph and blowing dust.

- Much cooler Tuesday through the rest of the week as
  precipitation continues.

&&

.SHORT TERM /Through Thursday Night/...
Issued 241 PM MDT MON MAY 25 2026
Warm today with high temps 10-15 degrees above normal. A strong
cold front will pass through eastern Oregon tonight and western
Idaho tomorrow morning. Ahead of the cold front, high based
showers and thunderstorms are developing in SW Idaho highlands
and in Central Idaho Mountains. These storms are capable of
producing outflows 40-60 mph in an environment with 1000 J/kg of
DCAPE. Also ahead of the front, winds across the area are
increasing. In SE Oregon, sustained winds of 20-30 mph and gusts
up to 40 mph with dry conditions have prompted the issuance of a
Red Flag Warning. Winds in SW Idaho will be slightly lower,
10-20 mph sustained and gusts up to 30 mph outside of
thunderstorms. Winds will also kick up blowing dust, locally
reducing visibility and air quality. While storms today are high
based and dry, tonight and tomorrow behind the front
precipitation chances increase and temperatures drop down to
near normal. Scattered showers continue over the region through
Wednesday, with storm total rainfall amounts around 0.25 inches
for much of the area, lower in the Snake Plain and higher over
mountains. Thunderstorms are possible each afternoon/evening
with gusty winds and heavier rainfall rates.

&&

.LONG TERM /Friday through Tuesday/...
Issued 241 PM MDT MON MAY 25 2026
An active weather pattern will continue through most of the
long-term period, as the upper low lingering over the Great
Basin will continue widespread showers and thunderstorms
Thursday through Saturday. Temperatures will mostly hover near
or slightly below normal through the end of the week. An upper
trough will slowly steer into the northwest region from off the
coast of British Columbia over the weekend. There is strong
guidance agreement that this larger system will swallow the low
over the Great Basin and steer it as a shortwave trough over our
area. This pattern will likely continue widespread showers and
thunderstorms on Saturday. Sunday will likely see
showers/thunderstorms over higher terrain as this merged system
moves out, before a broad ridge builds in and returns warmer and
drier conditions early next week.

&&

.AVIATION /06Z Tuesday through Wednesday/...
Issued 1208 AM MDT TUE MAY 26 2026

Generally VFR. Scattered showers and isolated thunderstorms
overnight, with outflow gusts to 30-35 kt. Showers increasing across
eastern OR early Tue/AM, with ceilings lowering to MVFR near
KBKE/KBNO. Thunderstorms developing across central ID Tue PM, with
outflows to 35-45 kt. Surface winds outside of storms: winds
shifting to W-NW 10-25 kt with gusts to 20-40 kt behind cold front
overnight, strongest near KBKE/KONO. Winds aloft at 10kft MSL: S-SW
10-30 kt.

KBOI...VFR. Occasional weak showers/virga overnight through morning,
with erratic outflows possible. Showers will increase Tuesday
afternoon, with a 20% chance of lightning. Surface winds outside of
storms: W-NW 5-15 kt behind cold front overnight. Period of gusts to
20-25 kt possible with frontal passage. Then, NW 10-20 kt with gusts
around 25-30 kt Tue afternoon.

&&

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

OR...None.

&&

$$

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AVIATION.....SH
SHORT TERM...JM
LONG TERM....JY