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Fort Chartres State Park, IL Weather Forecast
Fort Chartres State Park, IL Weather Forecast Date: 223 AM CDT Sun Aug 02 2026
The area/counties/county of: Randolph County Il, including the cities of: Chester and Sparta.or toggle through each period.
Rest of Tonight... Cloudy with drizzle. Near steady temperature in the upper 60s. Northwest winds 10 to 15 mph.
Sunday... Mostly cloudy with a chance of drizzle in the morning, then mostly sunny in the afternoon. Highs around 80. North winds 10 to 15 mph with gusts up to 25 mph.
Sunday Night... Mostly clear. Lows in the mid 60s. North winds 5 to 10 mph.
Monday... Sunny. Highs in the mid 80s. North winds around 5 mph.
Monday Night... Clear. Lows in the mid 60s. Northeast winds around 5 mph in the evening, becoming light and variable.
Tuesday... Mostly clear. Highs in the upper 80s. Lows in the mid 60s.
Wednesday... Mostly clear. Highs in the upper 80s. Lows in the mid 60s.
Wednesday Night... Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 20%.
Thursday... Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Highs in the upper 80s. Chance of rain 40%.
Thursday Night... Partly cloudy with a chance of showers and thunderstorms. Lows around 70. Highs in the upper 80s. Chance of rain 30%.
Friday... Partly cloudy with a chance of showers and thunderstorms. Lows around 70. Highs in the upper 80s. Chance of rain 30%.
POP = Probability of Precipitation
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