Fall on hold: Forecasters predict long-lasting warm temperatures in eastern U.S.
For about a week after the fall equinox, much of the eastern two-thirds of the Lower 48 states enjoyed crisp, refreshing autumn weather. But now Mother Nature has changed course. Warm, humid conditions more typical of late summer have returned and show little sign of retreating.
Forecasts now call for above-average temperatures lasting at least 10 days, with high temperatures in some areas nearly 30 degrees above normal at times. The core of the anomalous warmth is predicted to focus in the north-central United States, but above normal temperatures are anticipated to prevail in most places east of the Rockies.
The weather pattern may trigger heavy rainfall and severe storms in the central United States and could eventually support new tropical storm activity near the Gulf of Mexico.
Its not clear when this warm pattern will break down, and October is almost certain to end up warmer than normal over a large part of the nation.
https://www.washingtonpost.com/weather/2021/10/05/warm-fall-weather-eastern-us/?