Weather WorldMascoutah Lake, IL 7-Day Night Weather Forecast
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Mascoutah Lake, IL Weather Forecast
Mascoutah Lake, IL Weather Forecast Date: 128 PM CDT Mon Aug 17 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.
This Afternoon... Mostly sunny. Near steady temperature in the lower 80s. Northwest winds 5 to 10 mph.
Tonight... Partly cloudy in the evening, then clearing. Patchy fog after midnight. Lows in the mid 60s. North winds 5 to 10 mph in the evening, becoming light and variable.
Tuesday... Patchy fog in the morning. Sunny. Highs in the upper 80s. Southwest winds around 5 mph.
Tuesday Night... Mostly clear in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows in the upper 60s. South winds around 5 mph. Chance of rain 50%.
Wednesday... Mostly cloudy with showers and thunderstorms likely in the morning, then partly sunny with a slight chance of showers and thunderstorms in the afternoon. Humid with highs in the mid 80s. South winds around 5 mph, becoming east in the afternoon. Chance of rain 60%.
Wednesday Night... Mostly cloudy. A chance of showers and thunderstorms in the evening, then showers and thunderstorms likely after midnight. Lows in the upper 60s. Chance of rain 70%.
Thursday... Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 80s. Chance of rain 20%.
Thursday Night... Mostly clear. Lows in the mid 60s. Highs in the mid 80s.
Friday... Mostly clear. Lows in the mid 60s. Highs in the mid 80s.
Friday Night... Mostly clear. A slight chance of showers and thunderstorms. Lows in the mid 60s. Highs in the mid 80s. Chance of rain 20%.
Saturday... Mostly clear. A slight chance of showers and thunderstorms. Lows in the mid 60s. Highs in the mid 80s. Chance of rain 20%.
Saturday Night... Mostly clear. Lows in the mid 60s.
POP = Probability of Precipitation
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