Boise, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

781
FXUS65 KBOI 060235
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
835 PM MDT Sat Jul 5 2025

.DISCUSSION...Clear and cool tonight under dry westerly flow
aloft. Then sunny and warming next few days, with the hottest
day Tuesday when highs will reach 100 to 105 degrees in the
Treasure Valley and other lower southern valleys, and 80s
and 90s in the mountains and higher valleys. Modest cooling
Wednesday and Thursday then hotter again next weekend. No
thunderstorms until at least Tuesday. Current forecast is
on track.

&&

.AVIATION...VFR, except for patchy fog in mountain valleys
Sunday morning. Otherwise, mostly clear, except cumulus
buildups Sunday afternoon over the higher terrain. Surface
winds: variable less than 10 kt, becoming W-NW 5-15 kt Sunday
afternoon. Winds aloft at 10kft MSL: W-NW 10-20 kt.

KBOI...VFR. Surface winds: variable 6 kt or less, becoming
W-NW 7-12 kt Sunday afternoon.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Monday night...The region remains
dry under westerly flow on Sunday. Temperatures will warm to
near normal placing lower elevations at 85-90 degrees and
mountain valleys at 75-80 degrees. Monday will see further
warming as a closed low off the CA amplifies a downstream
ridge. For now it looks like dry and stable conditions will
inhibit shower/storm development on Monday, with cumulus
buildups along the NV border region the extent of any threat.
High temperatures on Monday will run 5-10 degrees warmer than
Sunday, pushing valleys into the mid-90s.

LONG TERM...Tuesday through Saturday...The heat will peak on
Tuesday beneath the upper ridge axis. Lower elevations
including the Treasure Valley, climb to 100-105 degrees, with
highs approaching 90 degrees in mountain valleys. Increasing
mid-level moisture over central Oregon will be something to
watch for thunderstorm potential. For now have increased
shower/storm threat to minimal 10% along an arc tracing from
Harney County through Baker County and into the w-central Idaho
mountains. The closed low off the central CA coast slips inland
on Wednesday, tracking into the northern Great Basin. Similar to
Monday, feel ensemble blend is under- representing potential
for afternoon showers/storms across higher terrain along the
OR/NV and ID/NV border. Did slightly bump up PoPs in SE Oregon
and higher terrain south of the Snake River and would expect
these probabilities to rise as we get into Tue/Wed. The
remainder of next week looks dry with the storm track remaining
to our north and east, and an amplifying upper ridge returning
by next weekend. Temperatures will hold at or above normal
through Saturday.

&&

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

&&

$$

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DISCUSSION...LC
AVIATION.....ST
SHORT TERM...DG
LONG TERM....DG