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St Charles County, MO Weather Forecast
St Charles County, MO Weather Forecast Date: 1038 PM CDT Wed Sep 09 2026
The area/counties/county of: Madison County Il, including the cities of: Alton, Edwardsville, Belleville, Cahokia, Saint Charles, and Saint Louis.or toggle through each period.
Overnight... Showers with a chance of thunderstorms. Lows in the lower 70s. North winds around 5 mph. Chance of rain near 100%.
Thursday... A chance of thunderstorms. Showers, mainly in the morning. Cooler with highs around 80. North winds around 5 mph. Chance of rain near 100%.
Thursday Night... Mostly cloudy. Lows in the upper 60s. Northeast winds around 5 mph.
Friday... Partly sunny. Highs in the lower 80s. East winds around 5 mph.
Friday Night... Partly cloudy. Lows in the upper 60s. Southeast winds around 5 mph.
Saturday... Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20%.
Saturday Night... Partly cloudy. A slight chance of showers after midnight. Lows in the upper 60s. Chance of rain 20%.
Sunday... Partly cloudy. Highs around 90. Lows around 70.
Sunday Night... Partly cloudy. Highs around 90. Lows around 70.
Monday... Sunny. Highs in the mid 90s. Heat index values up to 100 in the afternoon.
Monday Night... Mostly clear. A slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20%.
Tuesday... Partly cloudy with a chance of showers with a slight chance of thunderstorms. Highs around 90. Lows in the upper 60s. Chance of rain 40%.
POP = Probability of Precipitation
St Charles County Radar Loop
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