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City of Mt. Vernon, IllinoisMount Vernon, IL 7-Day Night Weather Forecast
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Mount Vernon, IL Weather Forecast
Mount Vernon, IL Weather Forecast Date: 807 AM CDT Thu Sep 17 2026
The area/counties/county of: Jefferson, including the city of Mount Vernon.or toggle through each period.
Today... Sunny, hot with highs in the upper 90s. West winds 5 to 10 mph.
Tonight... Mostly clear. Lows in the lower 70s. West winds around 5 mph in the evening, becoming light and variable.
Friday... Sunny, hot with highs in the upper 90s. Northeast winds around 5 mph, becoming west in the afternoon.
Friday Night... Mostly clear. Lows in the lower 70s. Southeast winds around 5 mph.
Saturday... Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph.
Saturday Night... Partly cloudy. Hot. Lows around 70. Highs in the mid 90s.
Sunday... Partly cloudy. Hot. Lows around 70. Highs in the mid 90s.
Monday... Mostly cloudy. A chance of showers. Highs around 90. Lows in the lower 60s. Chance of rain 30%.
Monday Night... Mostly cloudy. A chance of showers. Highs around 90. Lows in the lower 60s. Chance of rain 30%.
Tuesday... Mostly sunny. Highs in the mid 80s.
Tuesday Night... Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 60s.
POP = Probability of Precipitation
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