Nampa, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

910
FXUS65 KBOI 201553
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
953 AM MDT Wed Aug 20 2025

.DISCUSSION...Showers and thunderstorms are ongoing near the
Western Magic Valley this morning, expected to continue nearby
(largely to the east) through 6 pm today. Otherwise, hot and
dry conditions to continue over the next few days, with a slight
warming trend from near normal temperatures to ~5 degrees above
normal Friday. Smoke from the Cottonwood Peak fire in Nevada
will continue to drift north/northeast. Models do not have this
mixing to the surface, however a notable amount of smoke aloft
will create hazy skies east of Mountain Home and near the
Western Magic Valley. Breezy conditions will be ongoing this
afternoon through the Snake Plain between KBOI and KTWF, with a
cold front approaching SE Oregon this afternoon into evening
before weakening and dissipating as it moves through SW Idaho
overnight.


&&

.AVIATION...VFR under mostly clear skies. Showers and
thunderstorms expected to continue mostly east of KTWF/KJER
through 00z Thursday. Local visibility reductions in the
W-Central ID Mountains and the ID/NV border due to wildfire
smoke. A cold front will move through SE Oregon/SW Idaho this
afternoon into evening, causing breezy gusts 20-25 kts. Breezy
winds, with gusts 20-25 kts, also expected between KBOI and
KTWF this afternoon into early evening. Surface winds: W-NW 5-15
kt. Winds aloft at 10kft MSL: SW to W 10-20 kt.

KBOI...VFR. Surface winds: NW 8-12 kt with gusts to 20 kt after
15Z.


&&

.PREV DISCUSSION...
SHORT TERM...Today through Friday night...Southwesterly flow
aloft around a Four-Corners high will continue today. There is
some moisture available in the flow south and east of Twin
Falls for a slight chance (less than 20 percent) of afternoon
and evening showers/thunderstorms, otherwise dry conditions
prevail. The high drifts westward through Friday, changing the
flows direction to more westerly on Thursday followed by ridging
on Friday. The means dry conditions area-wide, along with a
warming trend. Smoke from wildfires will continue, mainly in the
West Central Mountains and near the ID/NV border.

LONG TERM...Saturday through Wednesday...The high pressure
ridge remains strong on Saturday, which will likely be the
hottest day through the period. Highs could reach the century
mark in the lower valleys. Monsoonal moisture wrapping around
the area of high pressure to our south could reach our area by
Sunday or Monday. This brings with it a chance (20-40 percent)
of showers/thunderstorms - mainly the highlands along the
Nevada border and in central Idaho. Temperatures trend slightly
lower due to the increased clouds and chances of precipitation.

&&

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

&&

$$

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DISCUSSION...CH
AVIATION.....CH
SHORT TERM...BW
LONG TERM....BW