Idaho Falls Weather in September

Idaho Falls in eastern Idaho along the Snake River sits at 4,710 feet elevation with a true continental climate. Winters are significantly colder than Boise with temperatures regularly dropping below 0°F and substantial snowfall. The Snake River creates a riparian corridor through the city, and the city is in the Pacific Northwest volcanic zone with Craters of the Moon nearby.

Excellent shoulder season — warm with fewer tourists in many destinations.