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.
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 /18Z Friday through Saturday/
Issued 1126 AM MDT FRI JUN 5 2026 VFR. SCT to BKN mid and high clouds. Surface winds: W-SW 10-20kt this afternoon, except variable 5-10kt near KONO KBOI KMUO KTWF KJER, shifting to NW 10-20kt this evening, with gusts to 35kt near KONO behind a dry cold front. Winds aloft at 10kft MSL: W-SW 20-30kt.
KBOI...VFR. Light surface winds, shifting to NW 5-10kt this afternoon.
Weekend Outlook...VFR. Surface winds light overnight and NW 10-20kt Sat afternoon and W-NW 5-15kt Sun afternoon.
BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.
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