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St. Peter, IL Weather Forecast
St. Peter, IL Weather Forecast Date: 538 AM CDT Sun Sep 20 2026
The area/counties/county of: Montgomery County Il, including the cities of: Litchfield and Vandalia.or toggle through each period.
Today... Partly sunny. A slight chance of showers and thunderstorms this afternoon. Highs in the lower 90s. West winds around 5 mph. Chance of rain 20%.
Tonight... Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the mid 60s. Northeast winds 5 to 10 mph. Chance of rain 70%.
Monday... Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the morning. Cooler with highs in the upper 70s. Northeast winds 5 to 10 mph. Chance of rain 50%.
Monday Night... Mostly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.
Tuesday... Mostly cloudy in the morning, then becoming partly sunny. Highs in the lower 70s. Northeast winds 5 to 10 mph.
Tuesday Night... Partly cloudy. Lows in the lower 50s. Highs in the lower 70s.
Wednesday... Partly cloudy. Lows in the lower 50s. Highs in the lower 70s.
Thursday... Partly cloudy. Lows in the lower 50s. Highs in the lower 70s.
Friday... Partly sunny. Highs in the mid 70s.
Friday Night... Partly cloudy. Lows in the lower 50s. Highs in the upper 70s.
POP = Probability of Precipitation
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