Chicago, IL – Much of the Midwest is preparing for an early taste of fall as forecasters expect below-normal temperatures to settle in during the first full week of September.
According to the National Weather Service in Omaha, NE, the Climate Prediction Center’s 8-to-14-day outlook, released Tuesday, shows a strong likelihood of cooler-than-average conditions stretching from Colorado to West Virginia. The forecast, valid from September 3 to 9, suggests a 40 to 50 percent chance of below-normal temperatures across the region, including Illinois, Indiana, Wisconsin, and Michigan.
Meteorologists refer to this time of year as “shoulder season,” marking the transition from summer into fall. Typically, September 1 is considered the start of the meteorological fall, but this year’s outlook suggests the seasonal shift could feel more pronounced. “September 2025 looks like it may begin even cooler than it typically does,” the NWS noted in its update.
The pattern could bring relief to residents weary of summer heat, while also signaling an early start to fall activities across the Midwest. Cooler air masses pushing in from the north are expected to drive daytime highs below seasonal averages, while overnight lows could dip sharply, especially in rural areas.
The cooler weather is not expected to be uniform nationwide. Warmer-than-normal conditions are forecast for parts of the Pacific Northwest, Florida, and the Northeast coast. Meanwhile, states like Missouri, Kentucky, and Tennessee could see temperatures close to seasonal norms during the same period.
Residents across the Midwest are encouraged to prepare for fluctuating conditions as September begins. The cooler pattern may benefit agriculture in some areas but could also accelerate the need for early harvest adjustments.
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