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St. Elmo, IL Weather Forecast
St. Elmo, IL Weather Forecast Date: 233 AM CDT Mon Sep 14 2026
The area/counties/county of: Montgomery County Il, including the cities of: Litchfield and Vandalia.or toggle through each period.
Rest of Tonight... Partly cloudy. Near steady temperature around 60. Northeast winds 5 to 10 mph.
Monday... Mostly sunny. Highs in the mid 80s. East winds 5 to 10 mph with gusts up to 20 mph.
Monday Night... Mostly clear. Lows in the upper 60s. Southeast winds 5 to 10 mph.
Tuesday... Sunny. A chance of showers with a slight chance of thunderstorms in the afternoon. Warmer with highs in the upper 90s. South winds 5 to 10 mph. Chance of rain 50%. Heat index values up to 105 in the afternoon.
Tuesday Night... Showers likely with a chance of thunderstorms in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Lows around 70. South winds around 5 mph in the evening, becoming light and variable. Chance of rain 60%. Heat index values up to 100 early in the evening.
Wednesday... Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the mid 90s. Chance of rain 20%. Heat index values up to 105.
Wednesday Night... Partly cloudy. Lows around 70. Highs in the lower 90s. Heat index values up to 100.
Thursday... Partly cloudy. Lows around 70. Highs in the lower 90s. Heat index values up to 100.
Friday... Partly cloudy. Lows around 70. Highs in the lower 90s. Heat index values up to 100.
Saturday... Partly cloudy. A slight chance of showers and thunderstorms. Highs around 90. Lows in the mid 60s. Chance of rain 20%.
Saturday Night... Partly cloudy. A slight chance of showers and thunderstorms. Highs around 90. Lows in the mid 60s. Chance of rain 20%.
POP = Probability of Precipitation
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