AccuWeather:
Widespread heat has shattered records from coast to coast throughout the first half of summer, but the longest days of 2023 are in the rearview mirror and cooler weather is on the horizon.
Astronomical autumn officially arrives on Saturday, Sept. 23, at 2:50 a.m. EDT, a few weeks after the arrival of meteorological fall. Regardless of which date you celebrate the start of autumn, it may take some time before fall weather takes hold across the country.
