textproduct: Boise

LONG TERM...Thursday through Monday

A large ridge is expected to hang over the region early Thursday, as it gets slowly broken down by an incoming upper trough from SW Canada. There still remains considerable guidance uncertainty over this trough's behavior and arrival. For now, chances of precipitation (light rain in lower elevations and possible wintry mix in higher elevations) are generally expected from Thursday to Sunday. There is general agreement that the incoming trough pattern will bring a significant cooling trend towards the end of the extended period. Peak lower elevation temperatures are expected to remain in the upper 40s Thursday and Friday, before dropping into the lower to mid 40s Saturday and into the upper 30s Sunday. Snow levels are expected to take on a downward trend from the 5000-6000 ft range Thursday to the 3000-4000 ft range Friday through Saturday, and into the 1000-2000 ft range Sunday through Monday. As such, Sunday will see the highest chances of snowfall, especially over the mountains. Monday will see a large ridge off the Pacific build into the region, bringing a drying trend. Peak lower elevation temperatures will tentatively remain on the cooler side (upper 30s and lower 40s) with snow levels still mostly lingering in the 1000-2000 ft range.

AVIATION

VFR/MVFR cloud ceilings overnight into Monday morning with IFR/LIFR stratus in the mountains. Widespread mountain obscuration. Light precipitation across the central mountains (KBKE and KMYL) overnight and few light showers Monday morning elsewhere. Snow levels 5-6kft MSL, lowering to 3-4kft by Monday afternoon. Surface winds: Variable less than 10 kt, becoming W-NW 10-20 kt Monday afternoon, with gusts 25-35 kt across S-Central ID. Winds aloft at 10kft MSL: W-SW 25-40 kt, becoming NW after Mon/18z.

KBOI...VFR with lowering ceilings overnight. A few light rain showers Monday morning, mainly between 12-16z. Surface winds: Light and variable, becoming NW late Monday morning with gusts 20-25 kt in the afternoon.

CLIMATE

Through November 23rd, 2025, the average temperature has reached 49.3 degrees, making it one of the warmest Novembers on record for Boise, Idaho. This ranks as the second warmest November, only slightly behind the record of 50.0 degrees set in 1934. It's only just warmer than the third- place average of 49.0 degrees in November 1903 and the fourth- place average of 48.9 degrees in November 2016. Records began in 1875.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None. OR...None.