textproduct: Boise

KEY MESSAGES

- Dry early this week with temperatures warming to around 10 degrees above normal on Wednesday.

- Breezy Wednesday and Thursday with shower and thunderstorm potential across east-central Oregon and west-central Idaho as a cold front moves through.

- Mostly dry and breezy this weekend with temperatures swinging from around 10 degrees above normal on Friday to around 5 degrees below normal by Sunday.

SHORT TERM /Through Thursday Night/

An upper ridge will build over the area today into early Wednesday with continued warmer and dry conditions. Highs will warm around 5 degrees each day, reaching about 10 degrees above normal on Wednesday. An upper level trough will move across our area late Wednesday. The center of the trough will move across east-central Oregon into west-central Idaho, bringing a 20-50% chance of showers and thunderstorms to these areas Wednesday afternoon into Wednesday night. To the south, chances will be lower with a 20% chance over the higher terrain and a 5-10% chance over the lower elevations.

The trough will also push a cold front through late in the afternoon and evening. The timing will keep highs cooler across southeast Oregon than southwest Idaho. Southwest winds will pick up ahead of the front and gust 15-30 mph, then switch to the northwest behind the front with gusts 20-40 mph Wednesday night into Thursday. The strongest winds will be Wednesday night along the I-84 corridor between Baker City and Ontario and south of Boise, and Thursday east of Boise into the Magic Valley. Highs Thursday will be 5-10 degrees cooler in most areas with a return to dry conditions.

LONG TERM /Friday through Tuesday/

An upper level ridge will move across our area on Friday, pushing temperatures back to around 10 degrees above normal. Southwest flow will bring breezy conditions to the higher terrain and southeast Oregon with gusts 20-35 mph. A deep upper level trough will move into the Pacific Northwest on Saturday, pushing another cold front through our area. Highs Saturday and Sunday are forecast to drop 10-15 degrees from Friday and dip to slightly below normal by Sunday. The trough is expected to weaken as it moves inland with most of the energy moving well to our north. This keeps our area mostly dry with a 20% chance of showers and thunderstorms over the northern mountains and lower chances elsewhere. The front will bring gusty winds to our area with current model blends indicating potential for gusts 30-45 mph. For Monday and Tuesday, ensembles favor ridging gradually building across the West with troughing along the coast. Highs are favored to warm to 5-10 degrees above normal. However, confidence is lowered by the proximity of the trough, which also introduces a 10-20% chance of showers and thunderstorms across our area on Tuesday.

AVIATION /06Z Tuesday through Wednesday/

Issued 1147 PM MDT MON JUN 1 2026 VFR. Scattered high clouds from north overnight through morning. Surface winds: Variable overnight, becoming N-NW 6-12 kt Tuesday afternoon. Winds aloft at 10kft MSL: westerly 10-20 kt.

KBOI...VFR with few-sct high clouds. Surface winds: SE less than 7 kt overnight, becoming NW 6-12 kt in the afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.