Monday, April 20, 2026

A late April freeze to start, calm weather to follow

Frigid Start:

It's a downright cold start to the morning across the Stateline with temperatures in the upper 20s. Because of that, all of northern Illinois is under a Freeze Warning through 9AM, a reminder that winter isn't quite ready to let go just yet. 

After a frigid morning, conditions improve nicely as the day progresses. High pressure building into the Great Lakes region will bring dry, sun-filled skies across northern Illinois. As that system settles in, winds will turn to the south and southwest, helping temperatures to climb into the mid 50s. Compared to late-April standards, this comes a few degrees below average for the city of Rockford. Overnight low will fall into the upper 40s under a partly to mostly cloudy sky. 

Storm Chances Tuesday:

Moving forward into Tuesday, much of the day will be dry under a partly cloudy sky. However, late in the day and into the evening, a weak disturbance moving in aloft could spark up a few thunderstorms. Coverage looks limited, hence the "non-severe" risk given by the Storm Prediction Center. Afternoon highs will be much warmer, landing in the low 70s. Highs will also peak in the 70s on Wednesday. 

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