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

- Dry with temperatures averaging 10-15 degrees above normal through next week.

- Minor disturbance on Monday could bring showers to higher terrain along the NV border and south-central Idaho mountains.

SHORT TERM /Through Saturday Night/

Issued 218 PM MDT THU OCT 1 2026 Dry westerly flow remains in place on Friday. There will be an increase in high clouds as moisture off the CA coast is picked up by the flow aloft. An upper ridge expands over the region on Saturday which will result in lighter winds and continued warming. High temperatures both days top out between 10 to 15 degrees above normal. Hazy conditions due to smoke will be seen across portions of SE Oregon and the west-central ID mountains.

LONG TERM /Sunday through Thursday/

Issued 218 PM MDT THU OCT 1 2026 The trend of warmer and drier than normal is set to continue through the period, with temperatures staying 10 to 15 degrees above normal. Sunday is forecast to be the warmest day with the furthest north amplification of the upper-level ridge over the area and southerly flow aloft. Temperatures are forecast to be near record highs for the day across the region. On Monday, a weak upper-level shortwave trough will move through the area, suppressing the ridge further south. This system will increase cloud cover and support a low chance (5-10%) of showers near the NV border and south-central Idaho mountains. Temperatures will cool by a couple of degrees Mon/Tue, before the upper ridge rebounds and warm and dry conditions prevail.

AVIATION /00Z Friday through Saturday/

Issued 539 PM MDT THU OCT 1 2026 VFR. Areas of thin smoke layers aloft/haze at the surface, mainly north of KBNO and near KMYL. Patchy fog in sheltered mountain valleys Friday morning. Surface winds: W-NW under 5-10 kt this evening, becoming variable or SE under 7 kt overnight through Friday morning. Winds aloft at 10kft MSL: W-SW 10-20 kt.

KBOI...VFR with mostly clear skies. Surface winds: NW 4-9 kt this evening, becoming SE or variable under 7 kt after sunset through Friday morning.

Weekend Outlook...VFR Friday through Sunday. Potential for thin smoke layers aloft and haze at the surface due to prescribed burns in the region. Surface winds: SW-NW 5-15 kt Friday, with afternoon gusts around 20 kt near NV border. Then, variable up to 10 kt Sat/Sun.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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