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St Clair County, IL Weather Forecast
St Clair County, IL Weather Forecast Date: 458 PM CST Mon Mar 02 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.
Tonight... Cloudy. Rain with a slight chance of thunderstorms after midnight. Patchy fog after midnight. Near steady temperature around 40. East winds around 5 mph. Chance of rain 90%.
Tuesday... Rain in the morning, then rain likely with a slight chance of thunderstorms in the afternoon. Not as cool with highs around 60. East winds around 5 mph. Chance of rain near 100%.
Tuesday Night... Rain. A slight chance of thunderstorms in the evening, then a chance of thunderstorms after midnight. Patchy fog after midnight. Not as cool with lows around 50. Northeast winds 5 to 10 mph. Chance of rain 90%.
Wednesday... A chance of thunderstorms. Rain. Highs in the mid 60s. South winds 5 to 10 mph. Chance of rain 90%.
Wednesday Night... Rain. A chance of thunderstorms, mainly in the evening. Lows in the mid 50s. South winds 5 to 10 mph. Chance of rain 90%.
Thursday... Mostly cloudy with rain with a chance of thunderstorms in the morning, then mostly sunny with a chance of rain with a slight chance of thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 80%.
Thursday Night... Mostly cloudy. A chance of rain and thunderstorms. Lows in the mid 50s. Highs in the upper 70s. Chance of rain 50%.
Friday... Mostly cloudy. A chance of rain and thunderstorms. Lows in the mid 50s. Highs in the upper 70s. Chance of rain 50%.
Friday Night... Mostly cloudy with a chance of thunderstorms. A chance of rain in the evening, then rain likely after midnight. Lows around 60. Chance of rain 70%.
Saturday... Cloudy with a slight chance of thunderstorms. Rain likely, mainly in the morning. Cooler with highs in the upper 60s. Chance of rain 70%.
Saturday Night... Mostly cloudy with a 30% chance of rain. Cooler with lows in the upper 40s.
Sunday... Mostly cloudy with a 20% chance of rain. Highs in the mid 60s. Lows around 50.
Sunday Night... Mostly cloudy with a 20% chance of rain. Highs in the mid 60s. Lows around 50.
POP = Probability of Precipitation
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