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City of Petersburg, ILPetersburg, IL 7-Day Night Weather Forecast
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Petersburg, IL Weather Forecast
Petersburg, IL Weather Forecast Date: 422 PM CST Thu Nov 12 2026
The area/counties/county of: Menard, including the city of Petersburg.or toggle through each period.
Tonight... Mostly clear. Lows in the lower 30s. Northwest winds 10 to 15 mph with gusts up to 25 mph.
Friday... Mostly sunny. Highs in the mid 40s. North winds 10 to 15 mph.
Friday Night... Clear. Lows in the mid 20s. Northwest winds around 5 mph.
Saturday... Sunny. Highs in the upper 40s. Northwest winds around 5 mph.
Saturday Night... Clear. Lows in the mid 20s. Light and variable winds.
Sunday... Sunny. Highs around 50.
Sunday Night... Clear. Lows in the upper 20s. Highs in the mid 50s.
Monday... Clear. Lows in the upper 20s. Highs in the mid 50s.
Tuesday... Clear. Lows in the upper 20s. Highs in the mid 50s.
Wednesday... Sunny. Highs in the upper 50s.
Wednesday Night... Partly cloudy. Lows around 40.
POP = Probability of Precipitation
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