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Autumn arrives with cooler temperatures, but how long will this last

Sunshine & cooler temperatures Monday
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Happy First day of Fall! 🍂

Fall officially arrives at 12:19 pm this afternoon, marking the autumnal equinox.

After Sunday’s front, Monday has been sunny, breezy, and cool. Monday night will be chilly—lows dip into the 30s and 40s—so grab a jacket if you’re out early Tuesday.

High pressure builds Tuesday and Wednesday, bringing bright skies and a warming trend. Expect big swings in temperature with cool mornings and warm afternoons. Some wildfire smoke may drift in through Tuesday but clear weather will be dominant for the rest of the week!

Future Smoke
Wildfire smoke will gradually build in and out. Being densest over Eastern Oregon, with light haze over Southwest Idaho.

Looking ahead, Thursday through the weekend stays mostly dry with above-normal highs. A weak system could knock temperatures down a few degrees on Friday, along with a breeze, but overall fall weather looks pleasant.

Stay up to date with my video Forecast

Scott Dorval's Idaho News6 Forecast - 9/2/25

Monday Night
Clear, with a low around 50. Diminishing NW breeze.

Tuesday
Sunny warmer but with a cool morning breeze, with a high near 82. Wiind SE 10-15.

Wednesday
Sunny & warmer with a cool morning breeze, with a high near 87. Wind SE 10-15.

Thursday
Sunny, warm & pleasant, with a high near 86.

Broncocast

Friday
Sunny, with a high near 82.

Friday Night
Mostly clear, with a low around 52.

Saturday
Sunny, with a high near 82.

Saturday Night
Mostly clear, with a low around 56.

Sunday
Sunny, with a high near 84.

Monday
Mostly sunny, with a high near 82.