September Begins with Record High Temperatures Nationwide

The start of September across the U.S. shows a mix of weather patterns. In Florida, temperatures will be warmer than average with highs near 93°, accompanied by spotty afternoon and evening thunderstorms, escalating to heavier storms with flooding risks by midweek due to a stalled front. Meanwhile, the upper Midwest and Great Lakes region are experiencing a significant cooldown with a strong cold front bringing temperatures twenty degrees below average, scattered showers, and breezy northwest winds ushering in the coolest air since spring. In contrast, western Washington is transitioning from a warm, dry summer to early fall, with temperatures climbing into the 80s midweek before cooling and cloudier skies return by the weekend, marking a shift toward typical fall weather. These regional differences highlight the varied climate conditions across the country as summer ends and autumn begins.