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Sparta, IL Weather Forecast
Sparta, IL Weather Forecast Date: 152 AM CDT Sun Sep 13 2026
The area/counties/county of: Randolph County Il, including the cities of: Chester and Sparta.or toggle through each period.
Rest of Tonight... Mostly clear. Lows in the mid 60s. Light and variable winds.
Sunday... Mostly sunny. Highs in the upper 80s. Northwest winds around 5 mph.
Sunday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 60s. Northeast winds around 5 mph.
Monday... Mostly sunny. Highs in the upper 80s. East winds 5 to 10 mph.
Monday Night... Mostly clear. Lows around 70. Southeast winds 5 to 10 mph.
Tuesday... Mostly clear. Highs in the mid 90s. Lows in the lower 70s. Heat index values up to 110.
Wednesday... Mostly clear. Highs in the mid 90s. Lows in the lower 70s. Heat index values up to 110.
Thursday... Mostly clear. Highs in the mid 90s. Lows in the lower 70s. Heat index values up to 110.
Thursday Night... A slight chance of thunderstorms in the evening. Partly cloudy with a slight chance of showers. Lows in the upper 60s. Chance of rain 20%.
Friday... Partly cloudy. A 20% chance of showers. Highs in the upper 80s. Lows in the mid 60s.
Friday Night... Partly cloudy. A 20% chance of showers. Highs in the upper 80s. Lows in the mid 60s.
POP = Probability of Precipitation
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