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St. Jacob, IL Weather Forecast
St. Jacob, IL Weather Forecast Date: 127 AM CDT Mon Sep 07 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.
Rest of Tonight... Mostly cloudy. Lows in the mid 60s. East winds around 5 mph with gusts up to 20 mph.
Monday... Sunny. Highs in the upper 80s. East winds 5 to 10 mph.
Monday Night... Mostly clear. Lows in the lower 60s. East winds 5 to 10 mph.
Tuesday... Mostly sunny. Hot with highs in the mid 90s. Southeast winds around 5 mph.
Tuesday Night... Partly cloudy in the evening, then becoming mostly clear. Not as cool with lows in the lower 70s. South winds 5 to 10 mph.
Wednesday... Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Chance of rain 20%. Heat index values up to 105.
Wednesday Night... A chance of thunderstorms. Showers. Lows around 70. Chance of rain 90%. Heat index values up to 100 early in the evening.
Thursday... Mostly cloudy with a chance of showers with a slight chance of thunderstorms in the morning, then mostly sunny in the afternoon. Cooler with highs in the mid 80s. Chance of rain 50%.
Thursday Night... Mostly clear. Lows in the lower 60s.
Friday... Mostly sunny. A slight chance of showers in the morning. Highs in the upper 80s. Chance of rain 20%.
Friday Night... Partly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the mid 60s. Highs in the lower 90s. Chance of rain 30%.
Saturday... Partly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the mid 60s. Highs in the lower 90s. Chance of rain 30%.
Saturday Night... Mostly clear. A slight chance of showers and thunderstorms. Lows in the upper 60s. Highs around 90. Chance of rain 20%.
POP = Probability of Precipitation
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