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

- Breezy northwest winds in the Snake Plain each afternoon through Wednesday.

- Fair skies and warmer temperatures through this weekend.

SHORT TERM /Through Wednesday Night/

Issued 157 PM MDT MON SEP 28 2026 As a trough moves east, high pressure builds to the south of our forecast area. Zonal flow will cap off the high pressure, leading to a moderated warming trend up to about 5 degrees above normal in the short term. Dry/fair weather is expected through the period, as moisture in the flow is positioned along the Canada-US border. West to northwest surface winds will become breezy each afternoon in the Snake Plain, especially between Boise and Twin Falls. The breezy 20-30 mph peak wind gusts occur in an area where forecast minimum relative humidities are around 15-20%, creating elevated fire weather though in a very localized portion of the high desert. Surface winds begin to taper off heading into the long term forecast.

LONG TERM /Thursday through Monday/

Issued 157 PM MDT MON SEP 28 2026 The area will remain under a flattened ridge north of a massive Pacific high slowly building into the Great Basin region. This continuous ridging pattern will favor clear skies, dry conditions, and the return of warmer than normal temperatures Thursday through Friday. A weak shortwave trough passing north of our area late Friday may bring in some high cloud coverage, possibly moderating the daytime temperatures on Saturday. Otherwise, broad Pacific ridging will dominate the region Sunday through early next week, continuing a much warmer and drier than normal pattern in the extended outlook.

AVIATION /06Z Tuesday through Wednesday/

Issued 1158 PM MDT MON SEP 28 2026

VFR. Surface winds: variable up to 12 kt, then W to NW 5-12 kt during the afternoon. Afternoon gusts around 20 kt between KBOI- KJER. Winds aloft at 10kft MSL: NW 10-20 kt.

KBOI...VFR. Surface winds: SE-SW 3-7 kt overnight, then NW 7-12 kt with gusts around 20 kt this afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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