Data: NOAA; Map: Jacque Schrag, Erin Davis, Kavya Beheraj/Axios For many Americans, the air is getting crisper and the leaves are starting to change as fall approaches — but one thing's certain ...

SEATTLE - Dress in warm layers this week! The evenings and mornings are turning quite chilly this time of year. Overnight lows in Seattle will plunge to the 40s on a daily basis this week.