AccuWeather's 2026 autumn outlook for the U.S. indicates that summer-like temperatures may endure into September, especially in the Mid-Atlantic and Southeast regions, influenced by a potentially robust El Niño affecting atmospheric conditions. The meteorological fall commences on September 1, while the astronomical autumn begins on September 22. Experts anticipate ongoing drought and wildfire threats in some Western areas, alongside possible tropical effects along the Gulf Coast and in the Carolinas. The first snowfall in mountainous regions may occur in late September or early October, with a higher likelihood of snow in November. Changes in weather patterns are predicted as El Niño intensifies.
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