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

- Slightly warmer today, but temperatures remaining slightly below normal with breezy conditions.

- Temperatures warming to around 5-10 degrees above normal by mid week.

- Breezy Wednesday and Thursday with shower and thunderstorm potential across the north.

SHORT TERM /Through Tuesday Night/

Issued 330 AM MDT SUN MAY 31 2026 An upper low over Montana this morning will continue to pull away from our area today. Dry conditions will prevail with continued breezy conditions, although not as gusty as yesterday. The strongest winds will be this afternoon east of Boise with gusts 20-30 mph. Temperatures will remain slightly below normal today, but increase a couple degrees from yesterday at most locations. Precipitation associated with the low will remain to our east with mostly clear skies. On Monday, a weak trough from the Pacific Northwest will move across our area and merge with the Montana low. This will introduce a 10-30% chance of showers and thunderstorms to the central Idaho mountains with lower chances elsewhere. Temperatures will increase up to 5 degrees from today as an upper ridge starts to build to our south. The warming trend will continue into Tuesday as the ridge builds north, with highs running 5-10 degrees above normal. Winds will be lighter Monday and Tuesday.

LONG TERM /Wednesday through Sunday/

Issued 330 AM MDT SUN MAY 31 2026 Daytime temperatures will continue to warm 10 degrees above normal Wednesday as southwest flow develops ahead of a weak, Pacific trough. The trough and accompanying cold front are forecast to arrive late Wednesday, introducing shower/thunderstorm chances across northeast Oregon and west- central Idaho Wednesday into Thursday. Winds will become breezy behind the cold front on Thursday, with temperatures lowering by several degrees. Dry and warming conditions will develop once again Friday ahead of the next Pacific trough expected for the weekend. This system will support stronger wind gusts for both Saturday and Sunday as it tracks east through Oregon and Idaho. Models currently disagree on shower/thunderstorm development, but the arrival of the cold front late Saturday will ensure much cooler temperatures by Sunday.

AVIATION /18Z Sunday through Monday/

Issued 1156 AM MDT SUN MAY 31 2026 VFR. Surface winds: W-NW 5-15 kt with gusts to 20-25 kt from KBOI to KTWF/KJER. Winds diminishing around sunset. Winds aloft at 10kft MSL: W-NW 10-20 kt.

KBOI...VFR. Surface winds: NW 5-12 kt with gusts to around 20 kt. Gusty winds diminishing after 01/01Z.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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