September Outlook: Above-Average Heat Across U.S., Northwest Cools

The September 2026 weather outlook forecasts above-average temperatures for much of the United States, with a notable exception being the Pacific Northwest and parts of California, which are expected to experience cooler-than-normal conditions. Released in late August by leading meteorological sources, this seasonal prediction is heavily influenced by a strengthening El Niño, a critical factor for fall preparations and environmental concerns.

Why This September Forecast Demands Attention

The September 2026 weather outlook is a major trending topic following comprehensive forecasts from key meteorological organizations. According to The Weather Channel, its detailed temperature and precipitation outlook was released on August 31, 2026. Similarly, The Old Farmer's Almanac published its fall predictions on August 29, 2026. These timely announcements inform the public as the nation transitions to fall, impacting everything from daily life to wildfire management.

Regional Temperature Outlook: Heat Dominates, Northwest Cools

Above-average temperatures are projected across much of the U.S. in September. The hottest conditions are anticipated in a corridor stretching from North Dakota, through the Plains, and into the northern half of Texas. Hotter-than-normal September conditions are also expected in the South, Gulf Coast, parts of the Midwest, southern Texas, and portions of New Mexico, Colorado, Wyoming, and Montana. The East Coast, other Midwest areas, the Southwest, and New England will also see higher temperatures, albeit less extreme than the central U.S.

Conversely, the Pacific Northwest and parts of California are the only regions expected to experience cooler-than-normal temperatures, offering potential relief from devastating wildfires. The East Coast and Pacific Coast could also see cooler-than-normal conditions. The Ohio Valley and Upper Midwest may experience a cooler September before temperatures normalize or slightly warm in October, while the Northeast is generally predicted for a cooler fall overall.

Precipitation Patterns: Mixed Forecasts Across the Nation

Precipitation forecasts for September 2026 present a varied picture. Most of the U.S., from the West Coast to the Southwest and Midwest, can anticipate above-normal precipitation. Specifically, an area covering the southern tip of California, Arizona, and parts of New Mexico, Nevada, and Utah is trending higher for rainfall. The West Coast, central and northern Rockies, parts of Texas, southern Florida, and the Northeast could also receive more rain than average.

However, several regions should brace for slightly below-average precipitation. The East Coast, Pacific Northwest, Ohio, the Southeast, and the Gulf Coast fall into this category. The Northeast, particularly upstate New York, is projected to be the driest region, trending below the norm. As confirmed by The Old Farmer's Almanac, much of the country is expected to be drier than usual this fall, with the Desert Southwest's rainfall expected to remain below average throughout the season.

The broader context for this September outlook is the significant influence of a strengthening El Niño, a climate pattern predicted to potentially develop into a 'super' El Niño by October. This event is currently outpacing the strong El Niño events observed in 1997 and 2015, suggesting its substantial impact on global weather patterns will extend throughout the coming months. These forecasts provide crucial information as communities prepare for the change of seasons and potential climate challenges.