Dramatic Weather Change for Illinois on 1st Official Day of Fall

Spend a few years in the Stateline area and you'll quickly find out we have 12 seasons, not just Spring, Summer, Winter, and Fall.

According to the latest extended forecast from The Weather Channel, it appears we will have the last of our 2nd Summer this upcoming weekend before a significant change to our weather arrives.

Weekend Starts With Summer-like Heat

If you haven't closed up your pool yet you'll be able to get some use out of it on Friday (9/20) when temperatures in the Rockford region are expected to rise into the upper 80s, and then on Saturday (9/21), it will be mostly sunny and in the lower 90s.

There's only about a 10 percent chance of any precipitation on Friday and during the day Saturday, according to the current Weather Channel forecast, but that all changes going into Sunday.

First Day of Fall on Sunday Brings Cooler Weather

It hasn't felt like Fall for the past week or so with temperatures warmer than normal for this time of year, but it's not actually Autumn yet.

Autumnal Equinox is the first day of the Astronomical Fall season and this year it happens on Sunday (9/22) at exactly 8:44 am, according to the Detroit Free Press.

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When you look at the current forecast for the Rockford area, it appears that Fall-like weather will arrive around that time Sunday morning.

Thunderstorms Possible to Start Autumn in Rockford

According to the extended forecast from the National Weather Service, we'll have about a 40 percent chance of thunderstorms on Saturday night, and a 70 percent chance of rain and storms on Sunday with high temperatures only reaching the upper 60s.

Another 40 percent chance of showers are in the forecast next Monday and Tuesday with highs only in the lower 70s. Lows will begin to dip into the upper 40s to lower 50s beginning early next week, according to the Weather Channel.

If the current forecast holds, high temperatures will stay in the 70s from this Sunday through the end of September.

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LOOK: The most extreme temperatures in the history of every state

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Keep reading to find out individual state records in alphabetical order.

Gallery Credit: Anuradha Varanasi

Filed Under: Rockford News