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City of St. Charles, MOSt Charles, MO 7-Day Night Weather Forecast
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St Charles, MO Weather Forecast
St Charles, MO Weather Forecast Date: 858 AM CDT Sat Sep 12 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.
Today... Areas of fog this morning. Sunny. Highs in the lower 90s. West winds around 5 mph.
Tonight... Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 60s. Northwest winds around 5 mph in the evening, becoming light and variable.
Sunday... Partly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Northwest winds 5 to 10 mph. Chance of rain 40%.
Sunday Night... Mostly cloudy. A chance of showers and thunderstorms, mainly in the evening. Lows in the lower 60s. Northeast winds 5 to 10 mph. Chance of rain 40%.
Monday... Mostly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Highs in the upper 80s. East winds 5 to 10 mph. Chance of rain 40%.
Monday Night... Mostly clear. Hot. Lows around 70. Highs in the mid 90s. Heat index values up to 105.
Tuesday... Mostly clear. Hot. Lows around 70. Highs in the mid 90s. Heat index values up to 105.
Tuesday Night... Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 70s. Heat index values up to 100 early in the evening.
Wednesday... Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Chance of rain 20%. Heat index values up to 105.
Wednesday Night... Partly cloudy in the evening, then becoming mostly clear. A slight chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 20%. Heat index values up to 100 early in the evening.
Thursday... Mostly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 40%.
Thursday Night... Partly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the mid 60s. Highs in the mid 80s. Chance of rain 30%.
POP = Probability of Precipitation
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