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Lake Petersburg, IL 7-Day Night Weather Forecast
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Lake Petersburg, IL Weather Forecast
Lake Petersburg, IL Weather Forecast Date: 128 PM CDT Wed Aug 05 2026
The area/counties/county of: Menard, including the city of Petersburg.or toggle through each period.
This Afternoon... Partly sunny with a chance of showers and thunderstorms. Near steady temperature in the lower 80s. South winds 5 to 10 mph. Chance of rain 50%.
Tonight... A chance of thunderstorms. Showers likely. Lows in the upper 60s. Southeast winds 5 to 10 mph, becoming south after midnight. Chance of rain 70%.
Thursday... Mostly cloudy with showers likely with a chance of thunderstorms in the morning, then partly sunny with a slight chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Southwest winds around 5 mph. Chance of rain 70%.
Thursday Night... Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the upper 60s. Southeast winds around 5 mph. Chance of rain 30%.
Friday... Partly sunny. A chance of showers in the afternoon. Humid with highs in the mid 80s. Southwest winds around 5 mph. Chance of rain 30%.
Friday Night... Partly cloudy. A chance of showers in the evening. Lows in the upper 60s. Chance of rain 50%.
Saturday... Partly sunny in the morning, then clearing. Highs in the mid 80s.
Saturday Night... Mostly clear. Lows in the upper 60s.
Sunday... Mostly sunny. Highs in the upper 80s.
Sunday Night... Partly cloudy. A chance of showers after midnight. Lows in the lower 70s. Chance of rain 30%.
Monday... Mostly sunny. Highs around 90. Heat index values up to 100 in the afternoon.
Monday Night... Partly cloudy with a chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 40%.
POP = Probability of Precipitation
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