Weather WorldSummersville, IL 7-Day Night Weather Forecast
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Summersville, IL Weather Forecast
Summersville, IL Weather Forecast Date: 812 PM CDT Sun Oct 25 2026
The area/counties/county of: Jefferson, including the city of Mount Vernon.or toggle through each period.
Tonight... Mostly cloudy. Lows in the lower 50s. Calm winds.
Monday... Partly sunny. Highs in the upper 70s. Southwest winds around 5 mph.
Monday Night... Partly cloudy. Lows in the upper 40s. Calm winds.
Tuesday... Partly sunny. Highs in the mid 70s. South winds around 5 mph.
Tuesday Night... Mostly cloudy in the evening, then becoming partly cloudy. Lows around 50. South winds around 5 mph in the evening, becoming light and variable.
Wednesday... Sunny. Highs in the upper 70s.
Wednesday Night... Clear. Lows in the lower 50s.
Thursday... Sunny. Highs in the lower 80s.
Thursday Night... Partly cloudy. Lows in the lower 50s. Highs in the lower 80s.
Friday... Partly cloudy. Lows in the lower 50s. Highs in the lower 80s.
Friday Night... Mostly cloudy. Lows in the upper 50s.
Saturday... Mostly cloudy. A chance of showers in the afternoon. Highs in the mid 70s. Chance of rain 30%.
Saturday Night... Showers. Lows in the upper 50s. Chance of rain 80%.
POP = Probability of Precipitation
Summersville Radar Loop
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