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

- Mostly dry with temperatures 10 to 15 degrees above normal through Memorial Day.

- Gusty winds Monday ahead of a Pacific cold front, resulting in elevated fire weather conditions in eastern Oregon.

- Much cooler with gusty winds and a chance of showers and thunderstorms Tuesday through Thursday.

SHORT TERM /Through Monday Night/

Issued 203 PM MDT SAT MAY 23 2026 High pressure remains in control through Monday with increasing southwest flow aloft. This will pump up the temperatures both Sunday and Monday, with a 75-85 percent chance of exceeding 90 degrees in the lower valleys on Monday. Winds are expected to pick up from the southwest Monday afternoon, especially across eastern Oregon. These increasing winds in combination with low relative humidity, are expected to create an elevated risk of dangerous fire weather conditions for portions of Malheur and Harney counties. Anyone with outdoor plans on Monday across eastern Oregon should monitor the situation closely.

LONG TERM /Tuesday through Saturday/

Issued 203 PM MDT SAT MAY 23 2026 Unsettled conditions are expected for much of the week as a trough of low pressure works through the region. Guidance is coming into focus on a trough path that brings the low into northern Nevada early in the week before lifting it northward through Idaho and eventually into Montana. Enough moisture is forecast that most areas will see measurable precipitation. Temperatures will drop to 10-15 degrees below normal Tuesday through Thursday, and snow levels are expected to drop below 8000 feet Wednesday. Behind the trough there is good agreement that high pressure will again build across the region into the weekend.

AVIATION /00Z Sunday through Monday/

Issued 523 PM MDT SAT MAY 23 2026

VFR. Virga/isolated thunderstorms near the Nevada border, capable of outflow gusts to 35 kt. Activity will decrease around sunset, then return near the ID-NV border Sunday PM. Surface winds W to N 5-15 with gusts to 15-20 kt, then variable up to 10 kt beginning around sunset. Winds aloft at 10kft: WSW 10-20 kt.

KBOI...VFR. Surface winds: NW-N 5-10 kt with occasional gusts around 15 kt, then SE or variable around 5 kt after 02Z this evening.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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