September 2017 Monthly Outlook

It has been a cooler than normal August in Central Illinois and it looks like little will change as we roll through the beginning of September. 

Through August 28th, Peoria's average daily temperature is 71.8 degrees, that's 2 degrees cooler than the climatological normal. In fact, Peoria only hit 90 degrees once in the month of August, a month where the area averages 6 days at or above 90 degrees. The month has also been a dry month for Central Illinois with rainfall amounts that are 1-3 inches below average across the region.

Unfortunately, it looks like very little will change as we roll through September. While cooler, fall-like, temperatures may be welcomed by some, the dry weather that may come with it is not. 

The large scale trough that has been in place through much of August looks to remain in place through September. In fact, the weather pattern will become even more amplified by September 6th allowing fall like temperatures (highs in the upper 60s and lower 70s) to settle in to Central Illinois.

Troughiness across the Midwest will probably persist through the first two weeks before the upper-level pattern begins to flatten out allowing warmer temperatures to return to Central Illinois. However, even though temperatures will warm a bit towards the end of the month, the warming wouldn't be enough to off set the cooling at the beginning of the month.

 As for the lack of rainfall....I suspect this will continue through much of September as well. Persistent northwesterly flow will continue to bring dry air in to Central Illinois instead of the rich moist air we would see coming off of the Gulf of Mexico in a southerly flow. 

The U.S. sees more landfalling tropical storms and hurricanes in September than any other month of the year. It is the peak of the U.S. Hurricane season and while more tropical systems are bound to move through the Gulf of Mexico, the upper-level flow would likely direct most of this moisture east of Central Illinois. 

Summary 

  • Cooler than normal temperatures will continue 
  • Temperatures will be well below average between September 5th and September 12th with some moderation in temperatures by the end of the month
  • Drier than normal conditions will continue throughout the month with most rainfall associated with any tropical systems remaining east of the area. 

 


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