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

- Warmer and drier days through most of Thursday.

- Cold front and gusty winds Thursday evening, followed by breezy and cooler weather Friday.

- Stronger cold front late Saturday and Saturday evening with gusty winds, showers, and thunderstorms, then much cooler Sunday.

- Warming and drying again Monday and Tuesday.

SHORT TERM /Through Thursday Night/

Issued 212 AM MDT TUE SEP 8 2026 Weak upper low in northern Idaho will exit into Montana this morning, resulting in sunny, warmer, and drier days in our CWA through most of Thursday. Nights will stay cool. High temps will reach the 80s in the southern valleys Wednesday and especially Thursday. Tropical moisture will surge northward through CA and NV but not as far north as our CWA. An upper trough digging southward from western Canada will push a dry surface cold front through our CWA late Thursday and Thursday night. The front will bring gusty northwest winds and end the warm weather.

LONG TERM /Friday through Tuesday/

Issued 212 AM MDT TUE SEP 8 2026 Friday looks sunny, windy, and cooler behind Thursday night's cold front, but Saturday looks warmer again as upper flow backs to southwesterly. The southwest flow will be ahead of a deep, cold upper low moving southward from the BC coast to just off the WA and OR coast. That low is forecast to move rapidly inland across OR Saturday with a strong surface cold front, gusty winds at least 30 mph (partly due to the speed of the incoming low), and a chance of showers and thunderstorms, then much cooler Sunday. Monday will already be warming and drying again as the upper low moves all the way to North Dakota, and Tuesday looks sunny and warmer still under building high pressure aloft over the Great Basin.

AVIATION /18Z Tuesday through Wednesday/

Issued 1107 AM MDT TUE SEP 8 2026 VFR with mostly clear skies this afternoon and evening. Patchy fog in sheltered mountain valleys overnight through Wednesday late morning. Surface winds: generally variable less than 10 kt. Winds aloft at 10kft MSL: W around 15 kt.

KBOI...VFR and mostly clear. Surface winds: NW 5-10 kt, then light and SE under 6 kt tonight after sunset.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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