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
- Scattered showers today with scattered thunderstorms developing this afternoon.
- Daytime temperatures cooling to 5 degrees above normal through Sunday, then hotter and drier Monday through Wednesday with temperatures around 10 to 15 degrees above normal.
SHORT TERM /Through Monday Night/
Issued 401 AM MDT SAT JUN 20 2026 A weak system is moving northeastward over the Great Basin into southwest MT this afternoon. Scattered showers moving over the area today with light rain showers this morning. As the system moves northeast, partial clearing will lead to destabilization this afternoon, with scattered thunderstorms developing during the afternoon. Breezy west-northwest winds this afternoon, strongest in the Magic Valley. Drier air moves into the area on Sunday with afternoon west-northwest breezes. A ridge strengthens over the area on Monday with warmer temperatures. Temperatures will be around 5 degrees above normal through Sunday before a slight warming trend Monday.
LONG TERM /Tuesday through Saturday/
Issued 401 AM MDT SAT JUN 20 2026 A ridge will strengthen and remain over the area through at least Wednesday. Temperatures will be 10 to 15 degrees above normal with values 95-100F in the lowest valleys Tuesday and Wednesday. Near record highs possible on Wednesday afternoon, with BOI forecast of 98F tying the record of 98F set in 1992. Models indicate an upper level trough moving into the Pacific Northwest sometime between Thursday and Saturday. This system will bring much cooler temperatures and unsettled conditions by Friday and Saturday.
AVIATION /12Z Saturday through Sunday/
Issued 545 AM MDT SAT JUN 20 2026 Scattered rain showers with mountain obscuration. Scattered thunderstorms developing this afternoon, capable of erratic outflows to 25-45 kt, brief heavy rain, small hail, blowing dust. Surface winds outside of storms: variable 10 kt or less, then W-NW 5-15 kt with gusts to 20-25kt Sat PM. Winds aloft at 10kft: W-NW 5-20 kt.
KBOI...VFR. Mountains obscured NE of terminal in precipitation. Showers through 18-21Z. Surface winds: variable 10kt, becoming NW 5-15kt this afternoon.
Sunday Outlook...VFR and clearing skies Saturday night and Sunday, with breezy W-NW winds Sunday afternoon.
BOI WATCHES/WARNINGS/ADVISORIES
ID...Red Flag Warning until 6 PM MDT this evening for IDZ423-426. OR...Red Flag Warning until 5 PM PDT this afternoon for ORZ670-672.
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