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 warming through Friday. Breezy conditions tonight into Thursday.
- Well above normal temperatures over Memorial Day Weekend. Gusty winds and a few mountain showers on Memorial Day.
- Turning cooler with gusty winds and an increasing chance of precipitation starting Tuesday.
SHORT TERM /Through Friday Night/
Issued 239 PM MDT WED MAY 20 2026 An upper level trough will dive south across eastern Idaho tonight into Thursday. Aside from isolated to scattered showers and thunderstorms across the central Idaho mountains tonight, our area will remain dry. The trough will push a weak cold front across our area tonight into Thursday, bringing breezy conditions. Wind gusts of 25-40 mph will develop between Baker City and Ontario this evening along the front, with breezy conditions spreading into southern Idaho overnight. The strongest gusts on Thursday will be along and south of the Snake River with gusts 25-40 mph, and generally 15-25 mph elsewhere. Temperatures Thursday will remain nearly steady from today, or near normal. Temperatures will warm about 5 degrees on Friday as a ridge over the eastern Pacific starts to move inland. Winds will be much lighter on Friday.
LONG TERM /Saturday through Wednesday/
Issued 239 PM MDT WED MAY 20 2026 Warm and dry weather will continue through Memorial Day with temperatures running 10 to 15 degrees above normal. Lower valley locations will see temperatures in the upper 80s and low 90s on Sunday and Monday. Windy conditions are likely to develop in Oregon on Monday afternoon ahead of a strong cold front that is now forecast to pass through the area on Tuesday. Very windy conditions are likely to spread into Idaho on Tuesday with much colder air moving in behind the cold front. The upper level trough driving the cold front is likely to evolve into a closed low by Wednesday over southern Idaho bringing cool and showery weather to the area with snow levels coming down to around 5000 to 6000 feet.
AVIATION /00Z Thursday through Friday/
Issued 608 PM MDT WED MAY 20 2026 VFR, with SCT-BKN cumulus and high clouds this evening. Isolated showers and thunderstorms will continue over the central ID mountains NE of KMYL this evening. Surface winds: NW-N 10-15 kt with gusts up to 25 kt over most areas this evening, then lowering to 6-12 kt after sunset. Period of strong NW gusts 25-30 kt over KBKE and KONO this evening until midnight. Winds aloft at 10kft: NW 20 to 30 kt.
KBOI...VFR with few to scattered high clouds this evening. Surface winds: NW 10-15 kt with gusts up to 25 kt this evening, lowering down to 6-11 kt after sunset.
BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.
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