Caldwell, Idaho Weather Forecast Discussion

645
FXUS65 KBOI 182041
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
241 PM MDT Thu Sep 18 2025
.SHORT TERM...Tonight through Saturday night...High pressure
remains over the area with warm temperatures today and Friday.
A low pressure system over southern CA will slowly move
northward into the Great Basin tonight. High level clouds will
stream northward into southeast OR and southwest ID late this
afternoon, with mostly cloudy skies into Saturday and Sunday.
Temperatures will be slightly cooler due to cloud cover, but
still around 5 degrees above normal. There is a 10-15% chance
of showers and afternoon thunderstorms along the Idaho-Nevada
border Friday. The shower and thunderstorm chances expand into
southeast Oregon and the higher terrain south of the Snake River
Plain Saturday evening. These showers and storms have the
potential to produce outflow wind gusts up to 50 mph.
.LONG TERM...Sunday through Thursday...A cold frontal passage on
Sunday will increase shower and thunderstorm coverage across
east-central Oregon and the west-central Idaho mountains while
bringing gusty westerly winds to the region. Temperatures on
Monday lower to near normal. By Tuesday the ridge rebuilds over
the region with temperatures warming to around 10 degrees above
normal Tuesday and Wednesday. Forecast confidence beyond
Wednesday is low.
&&
.AVIATION...VFR. Increasing high clouds. Surface winds: E-SE
5-15kt, becoming light after sunset. Winds aloft at 10kft MSL:
variable 5-15kt.
KBOI...generally SE 5-10kt, except NW 5kt during the afternoon.
Weekend Outlook...Isolated showers and thunderstorms on
Saturday afternoon into Sunday. Gusty outflow winds up to 45kt
possible. Breezy west-northwest winds on Sunday afternoon behind
cold front.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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SHORT TERM...KA
LONG TERM....KA
AVIATION.....KA

NWS BOI Office Area Forecast Discussion