CHICAGO - Another beautiful early-September day is on the way.

Chicago weather forecast

What to expect:

Skies will be mostly sunny with a few clouds popping up in the afternoon. Highs will reach around 80 degrees. It will be a few degrees cooler by the lake again.

Tonight, cloud cover will increase with low temperatures in the 60s.

Tomorrow is cold-front day. Ahead of that front, it will still be fairly warm with highs ranging from the mid 70s north to the low 80s south of I-80. Showers and a few rumbles of thunder are likely during the afternoon and evening. That will be followed by sharply cooler air on Thursday when highs will be in the mid 60s.

Skies will become partly sunny but the next weak storm system is quickly approaching. That will bring a chance of showers to the area l

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