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  • Tim McGill

So Long Summer! Cool Pattern Coming Soon.

Welcome to meteorological fall! I've crunched the numbers for summer (June, July & August) and we had an average temperature of 76.7°. The average temperature for a day is the high and low added together and then divided by two. That would mean the summer of 2020 was the warmest summer on record for Chicago.

Today's highs should be a bit below average. Look for highs to reach into the upper 70s. Average high for this date is 80°.

A cooler pattern will be kicking in after this weekend. It will be a fairly dramatic drop in temperatures after such a warm summer. Highs next Monday will be between 10° to 20° below average across most of the midwest. That could mean middle 60s for us to start off next week. The temperature anomaly forecast has a big blob of blue settling south over the midwest Monday afternoon.

This flip to a cooler pattern may stick around through at least the middle of September. The 6-10 day and 8-14 day temperature probability forecasts have us outlooked for cooler than average temperatures overall from September 6th through the 14th. The core of the cooler air will be centered over the plains and midwest.

Some much needed rain will fall today. Augusts ended up a bit more than 4 inches behind in rainfall and we are more than 5 inches behind average since July 1st. Today's rainfall will be scattered but around 60% of the area could see some rain. Models are suggesting up to about a quarter of an inch of rain. A lot more rain is needed to prevent the moderate drought that has developed in some areas from expanding further into others. After today's rain our next decent chance for rain doesn't come until Sunday night into early Labor Day.

The flip to a cooler pattern may be accompanied by a flip to a wetter pattern too. The 6-10 and 8-14 day precipitation probability forecasts have us outlooked for above average precipitation overall from September 6th through the 14th.

Here is my 7 day forecast:

Today: Mostly cloudy, sct. showers & t-storms High: 78

Wednesday: Partly to mostly sunny Low: 66 High: 85

Thursday: Partly to mostly sunny, breezy Low: 65 High: 84

Friday: Mostly sunny Low: 58 High: 77

Saturday: Partly to mostly sunny Low: 59 High: 81

Sunday: Partly to mostly sunny Low: 62 High: 82

Monday: Sct. showers early then partly cloudy Low: 56 High: 66



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