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Auxiliary Reservoir, IL 7-Day Night Weather Forecast
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Auxiliary Reservoir, IL Weather Forecast
Auxiliary Reservoir, IL Weather Forecast Date: 1127 PM CDT Sun Aug 02 2026
The area/counties/county of: Jefferson, including the city of Mount Vernon.or toggle through each period.
Tonight... Partly cloudy this evening, then becoming mostly clear. Patchy fog after midnight. Lows in the lower 60s. North winds around 5 mph.
Monday... Patchy fog in the morning. Sunny. Highs in the mid 80s. North winds around 5 mph.
Monday Night... Mostly clear. Patchy fog after midnight. Lows in the lower 60s. Northeast winds around 5 mph in the evening, becoming light and variable.
Tuesday... Patchy fog in the morning. Sunny. Highs in the mid 80s. Calm winds.
Tuesday Night... Mostly clear. Lows in the mid 60s. Calm winds.
Wednesday... Mostly clear. Highs in the upper 80s. Lows in the upper 60s.
Wednesday Night... Mostly clear. Highs in the upper 80s. Lows in the upper 60s.
Thursday... Mostly sunny. A chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 30%.
Thursday Night... Partly cloudy with a chance of showers and thunderstorms. Lows in the upper 60s. Chance of rain 50%.
Friday... Partly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 40%.
Friday Night... Partly cloudy. Lows around 70. Highs around 90.
Saturday... Partly cloudy. Lows around 70. Highs around 90.
POP = Probability of Precipitation
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