September is a month of transition as the days get shorter and the temperatures start to become noticeably cooler throughout the month. High temperatures cool by more than 10º over the course of the month, and low temperatures drop nearly 15º as the high humidity of the Summer finally starts to subside.
Summer tends to hold on through the first half of September though, and that will be the case in 2018. A pattern that sends a big area of high pressure along the East Coast westward into the Southeast will keep the heat and humidity lingering around through the first half of the month. In southern Illinois, those needing rainfall may be hoping for a break down in the setup, with widespread storms becoming tough to come by in this pattern.
Along the outer edges of the high, moisture will pump into the Missouri Valley and Upper Midwest with potential for flooding rainfall over these areas of the Corn Belt. The resulting downstream rises along the rivers will be something to watch on the Mississippi River over the next few weeks.
LAST 30 DAYS RAINFALL OVERVIEW
Quite a bit of progression in relation to rainfall over the last 30 days across the region. Counties along the Ohio River and parts of the Missouri Bootheel have been dealing with a lot of dry weather over the course of the Summer, but finally, these areas, especially Missouri, have seen a little relief.
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| Rainfall compared to normal over the last 30 days (August 1-August 30th) |
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| Radar estimated rainfall over the last 30 days (August 1-August 30th) |
Further north, it's a completely different story. Several large storm complexes have brought very heavy rainfall across southwest Illinois and the St. Francois Mountains of southeast Missouri.
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