Illinois and the rest of the Midwest are off to a hot start in September. As the map below shows, areas in shades of brown were up to 9 degrees above average. This includes southern Illinois and much of the southern states in the Midwest. The areas in pinks and red were even farther above average, some 9 to 12 degrees above average. This includes most of the northern half of Illinois, as well as northern Missouri, Iowa, Minnesota, Wisconsin, and most of Michigan.
Cooler and more seasonable weather is expected in Illinois after today.