BOISE, Idaho — Autumn officially arrived Monday at 12:19pm, and the first day of the new season had a fall-like feel, as breezy northwest winds combined with below-average temperatures to keep things on the cool side. Treasure Valley temps reached just the low 70s on Monday, several degrees below normal for the kick-off to the fall season.

While mornings will remain on the cool side this week, summer makes a return in the afternoons as a ridge of high pressure builds in from the southwest starting Tuesday. Temperatures in the Boise area will rise into the mid-80s by mid-week, well above average for late September. High temperatures will remain 5-10° above normal through the end of the workweek.

On Friday, a weak disturbance will skirt by to the north, dropping temperatures just a few deg

See Full Page