USA TODAY Network

St. Clair County residents can expect a mostly sunny and comfortable week ahead, with daytime highs ranging from 69 to 77 degrees and crisp overnight lows dipping into the 40s and 50s, according to data from AccuWeather .

Whether you're planning a weekend outing or just wondering if you’ll need a jacket, this day-by-day forecast has you covered — including air quality alerts and hair frizz potential.

Michigan’s weather can be unpredictable, especially in areas like St. Clair County where Lake Effect conditions and limited weather monitoring can cause sudden shifts. Dr. Jeffrey Andresen, Michigan’s state climatologist, says these factors often lead to extreme highs and lows across the state.

Here’s your full St. Clair County weather outlook for the week of Sept. 9–12

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