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.
KEY MESSAGES
- Continued very warm and dry through Friday.
- Isolated thunderstorms late today and this evening along the ID/NV border.
- Much cooler, with showers possible, Saturday through Monday.
SHORT TERM /Through Wednesday Night/
High pressure aloft will continue very warm and mostly dry weather through the period. A weak upper low passing eastward across NV will develop isolated thunderstorms late today and this evening along the ID/NV border. Gusty outflow winds to 40 mph are possible from these storms. Light terrain-driven winds elsewhere. High temps will continue near record high levels with little day-to-day change. Nights will continue cool resulting in large diurnal ranges.
LONG TERM /Thursday through Monday/
Upper-level ridging, warm temperatures, clear skies, and calm winds will continue Thursday and Friday. Temperatures 10 to 20 degrees above normal will be seen across the area on these days. A drastic pattern change is forecast over the weekend, with an upper-level trough moving through the Pacific Northwest. Winds will start to pick up on Friday across the higher terrain, with gusts 20 to 30 mph. The trough will push a cold front through the area on Saturday, bringing cooler temperatures and breezy conditions into the lower valleys as well. Highs are forecast to cool by 10 to 15 degrees from Friday, but ensemble variability in the timing of the front reduces confidence in the temperature forecast for Saturday. The trough is favored to deepen over the Pacific Northwest and is becoming increasingly likely to move overhead as a closed low into early next week. This will continue the cooling trend on Sunday and Monday. A chance of precipitation will develop especially east of the low with a 20-40% chance of rain and high mountain snow across central/south central Idaho, and a 10-20% chance further west. Winds will remain breezy under this pattern.
AVIATION /18Z Monday through Tuesday/
Issued 1201 PM MDT MON OCT 5 2026
VFR. High clouds moving overhead today, decreasing tonight. Areas of smoke and haze may reduce visibility near prescribed burns. Isolated showers and thunderstorms late this afternoon and evening south of KTWF. Surface winds: variable less than 12 kt. Winds aloft at 10kft MSL: SW-W 5-15 kt.
KBOI...VFR with periods of high clouds. Surface winds: SE around 5 kt, becoming NW by mid-afternoon.
BOI WATCHES/WARNINGS/ADVISORIES
ID...None. OR...None.
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