Meteorological autumn starts Sept. 1, with the astronomical equinox arriving at 8:05 p.m. EDT on Sept. 22, but summer warmth is set to hold its ground across much of the United States for weeks longer than usual. According to AccuWeather’s 2026 fall forecast, an intensifying El Niño pattern in th e eastern Pacific Ocean will serve […] Strong El Niño Expected To Keep Late-Summer Heat Lingering Across The U.S. This Fall ...read more read less