BOISE, Idaho — Residents across Idaho should prepare for scattered thunderstorms in mountain regions on Sunday afternoon, followed by a notable 10–15° cooldown that will bring highs in Boise and the Treasure Valley into the low to mid-70s by Tuesday, according to the National Weather Service in Boise.
Mountain Storms on Sunday
Thunderstorms are most likely in Baker County, southern Twin Falls County, and higher elevation areas such as McCall, Stanley, and Sun Valley.
“Mountain communities such as McCall, Stanley, and Sun Valley will dip into the 50s and 60s with daily storm chances continuing through Thursday,” forecasters said.
Travelers on Highways 21 and 55 should prepare for wet pavement and reduced visibility, especially in the afternoon and evening.
Breezy Monday Before a Cooldown
Monday will remain mostly dry and breezy, with highs near the upper 80s in Boise. A sharp shift follows on Tuesday, when highs fall to the low to mid-70s, well below the early September average…