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Fillmore, IL 7-Day Night Weather Forecast
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Fillmore, IL Weather Forecast
Fillmore, IL Weather Forecast Date: 253 PM CDT Fri Sep 04 2026
The area/counties/county of: Montgomery County Il, including the cities of: Litchfield and Vandalia.or toggle through each period.
Tonight... Mostly clear this evening, then becoming partly cloudy. Lows in the mid 70s. Southwest winds around 5 mph this evening, becoming light and variable. Heat index values up to 101 early this evening.
Saturday... Sunny, hot with highs in the upper 90s. Northwest winds around 5 mph. Heat index values up to 106.
Saturday Night... Mostly clear. Lows around 70. Northeast winds around 5 mph. Heat index values up to 103 early in the evening.
Sunday... Mostly sunny. Highs in the lower 90s. Northeast winds 5 to 10 mph.
Sunday Night... Mostly clear. Lows in the lower 60s. East winds 5 to 10 mph.
Labor Day... Mostly clear. Highs around 90. Lows in the mid 60s.
Monday Night... Mostly clear. Highs around 90. Lows in the mid 60s.
Tuesday... Mostly clear. Hot. Highs in the mid 90s. Lows in the lower 70s.
Tuesday Night... Mostly clear. Hot. Highs in the mid 90s. Lows in the lower 70s.
Wednesday... Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Chance of rain 20%.
Wednesday Night... Mostly clear with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 30%. Heat index values up to 100 early in the evening.
Thursday... Partly cloudy with a slight chance of showers and thunderstorms. Highs in the lower 90s. Lows in the mid 60s. Chance of rain 20%.
POP = Probability of Precipitation
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