textproduct: Boise
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
UPDATE
Updated aviation discussion and Key Messages.
KEY MESSAGES
- Gusty afternoon winds today and especially Saturday, decreasing Sunday. - Very warm today, then cooler than normal Saturday through next Thursday, warming Friday through next weekend.
- Showers mainly Tuesday through Thursday, with significant precipitation possible.
SHORT TERM /Through Sunday Night/
Issued 316 AM MDT FRI JUN 5 2026 Warmer and becoming breezy today ahead of a north Pacific cold front forecast to reach se Oregon tonight and sw Idaho Saturday. Frontal zone will bring clouds but no rain. Even the hi-res models produce no more than sprinkles over highest terrain. However, the front will bring significant cooling along with gusty winds Saturday afternoon, gusts as strong as 35-40 mph in the Snake Basin se of Boise. The core of cool air aloft will move eastward across BC and Alberta, but a significant secondary lobe will pass through our CWA Saturday night and Sunday with even further cooling and continued gusty winds. Sunday looks moist enough for a 20-40 percent chance of showers in Valley County/ID and cold enough for snow above 5500 feet MSL. Skies will briefly clear Sunday night and with winds slowly decreasing, Monday morning looks cold with low temps in the 30s in the mountains through 40s in the valleys.
LONG TERM /Monday through Friday/
Issued 316 AM MDT FRI JUN 5 2026 The secondary cold lobe will exit rapidly east early Monday morning as another cool upper trough rushes in from the Gulf of Alaska. Eastern OR will cloud over by sunrise Monday and western ID by noon, with showers to follow late Monday and Monday night, continuing Tuesday. This time the core of cool air aloft will be farther south, passing across northern Idaho Tuesday, and again reinforced by a secondary lobe on Wednesday. Cool, breezy, and showery weather will continue through Thursday. A warming and drying trend will begin Friday as upper ridging replaces the eastward-exiting trough.
AVIATION /12Z Friday through Saturday/
Issued 601 AM MDT FRI JUN 5 2026 VFR with mostly clear skies. Dry cold front tonight in eastern Oregon, and Saturday morning in southwest Idaho. Surface winds: diurnal less than 10kt becoming SW-NW 10-20 kt with gusts to 25 kt by 05/20Z in Oregon and after 05/22Z in Idaho. Winds aloft at 10kft: W 20 kt becoming SW 20-25 kt after 05/20Z.
KBOI...VFR with a few high clouds. Surface winds: SE less than 10 kt becoming NW 8-12 kt after 05/20Z. Gusts to 25 kt after 06/08Z Saturday.
Weekend Outlook...VFR. Gusty west winds in the Snake Basin Saturday afternoon. Scattered rain and snow showers and local MVFR in northern mountains Sunday.
BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.
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