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Kstl-Am St. Louis, MO Weather Forecast
Kstl-Am St. Louis, MO Weather Forecast Date: 254 PM CDT Sat Aug 08 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... Clear. Lows in the lower 70s. South winds around 5 mph.
Sunday... Sunny with highs in the lower 90s. South winds 10 to 15 mph. Heat index values up to 104.
Sunday Night... Mostly clear. Humid with lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 103 early in the evening.
Monday... Mostly sunny. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 111 in the afternoon.
Monday Night... Mostly clear. Humid with lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 109 early in the evening.
Tuesday... Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 110.
Tuesday Night... Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 70s. Chance of rain 20%. Heat index values up to 105 early in the evening.
Wednesday... Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 40%. Heat index values up to 105.
Wednesday Night... Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50%. Heat index values up to 105 early in the evening.
Thursday... Showers and thunderstorms likely. Highs in the mid 80s. Lows around 70. Chance of rain 60%.
Thursday Night... Showers and thunderstorms likely. Highs in the mid 80s. Lows around 70. Chance of rain 60%.
Friday... Mostly cloudy with a chance of showers and thunderstorms. Highs in the mid 80s. Lows in the upper 60s. Chance of rain 50%.
POP = Probability of Precipitation
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