AccuWeather long-range experts say the transition to autumn will bring cooler air and sweater weather to millions of Americans. Others will be dealing with lingering summer heat, tropical storms, hurricanes, wildfires, or a smoky haze obscuring the sky. “Areas in the middle of the country, including Kansas to Wisconsin, will experience very pleasant and calm stretches of fall weather that will be perfect for fairs, festivals, and outdoor events like harvest,” said Long Range Expert Paul Pastelok.