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Defiance, MO Weather Forecast
Defiance, MO Weather Forecast Date: 348 PM 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.
Tonight... Mostly clear. Lows in the mid 60s. East winds around 5 mph.
Tuesday... Mostly sunny. Highs in the mid 90s. Southeast winds around 5 mph.
Tuesday Night... Mostly clear. Lows in the lower 70s. South winds 5 to 10 mph.
Wednesday... Sunny. A slight chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Chance of rain 50%. Heat index values up to 108.
Wednesday Night... Showers likely with a chance of thunderstorms in the evening, then showers with a slight chance of thunderstorms after midnight. Humid with lows in the upper 60s. West winds around 5 mph. Chance of rain near 100%. Heat index values up to 103 early in the evening.
Thursday... Showers likely with a slight chance of thunderstorms in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Cooler with highs in the lower 80s. Chance of rain 70%.
Thursday Night... Partly cloudy. Lows in the lower 60s.
Friday... Mostly sunny. A slight chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 20%.
Friday Night... Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 40%.
Saturday... Mostly sunny. A chance of showers in the morning, then a slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 40%.
Saturday Night... Mostly clear. A 20% chance of showers. Lows in the upper 60s. Highs in the upper 80s.
Sunday... Mostly clear. A 20% chance of showers. Lows in the upper 60s. Highs in the upper 80s.
Sunday Night... Mostly clear. Lows in the mid 60s.
POP = Probability of Precipitation
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