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
- Warm and dry conditions through the middle of next week, with above normal temperatures Tuesday-Thursday.
- Isolated showers and thunderstorms over southern Boise Mountains and the ID-NV border this evening.
- Cooler temperatures and precipitation next weekend.
SHORT TERM /Through Tuesday Night/
Issued 226 PM MDT SUN JUN 21 2026 A ridge of high pressure will build over the region today, with cumulus build ups and terrain induced afternoon showers and thunderstorms in central Idaho and near the Nevada border. Precipitation chances decrease after sunset, with a warming and drying trend expected for the rest of the short term period. Winds will increase each afternoon in the lower elevation valleys, with overnight gusty drainage winds in the Baker Valley and along the I-84 corridor near Ontario, OR.
LONG TERM /Wednesday through Sunday/
Issued 226 PM MDT SUN JUN 21 2026 Hot and dry conditions are expected through Thursday as the ridge of high pressure peaks midweek. Temperatures look to be slightly cooler than previously forecast, albeit still 5-10 degrees above normal, with highs generally in the low to mid 90s for most lower elevation valleys. Models remain keyed in on a closed low moving into the Pacific Northwest on Friday, with cooler temperatures and precipitation increasing through the weekend. The initial cold frontal passage on Friday afternoon will likely bring gusty winds and showers and thunderstorms over much of the area. Temperatures will be much cooler, with valley highs only reaching the upper 60s-low 70s. Overnight lows in mountain valleys could get close to freezing Saturday night into Sunday morning.
AVIATION /00Z Monday through Tuesday/
Issued 611 PM MDT SUN JUN 21 2026
VFR. Isolated, weak showers/thunderstorms over high terrain near KTWF through this eve. Surface winds: W-NW 5-15 kt becoming variable less than 10 kt overnight. Winds aloft at 10kft MSL: W 10-20 kt.
KBOI...VFR. Surface winds: NW-N 5-10 kt with gusts to 15-20 kt before sunset, then variable less than 6 kt overnight. Transitioning back to NW after Mon/15Z.
BOI WATCHES/WARNINGS/ADVISORIES
ID...OR...None.
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