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Monticello, IL 7-Day Night Weather Forecast
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Monticello, IL Weather Forecast
Monticello, IL Weather Forecast Date: 1237 AM CDT Wed Oct 14 2026
The area/counties/county of: Piatt, including the city of Monticello.or toggle through each period.
Rest of Tonight... Mostly cloudy with a chance of showers and thunderstorms. Lows in the upper 60s. West winds 5 to 10 mph. Chance of rain 50%.
Wednesday... Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Cooler with highs in the upper 70s. North winds 5 to 10 mph. Chance of rain 50%.
Wednesday Night... Mostly cloudy. A chance of showers after midnight. Lows around 60. Northeast winds 10 to 15 mph. Chance of rain 40%.
Thursday... A chance of thunderstorms. Showers. Highs in the mid 70s. East winds 5 to 10 mph, becoming south in the afternoon. Chance of rain near 100%.
Thursday Night... Showers likely with a chance of thunderstorms in the evening. Breezy, cooler with lows in the upper 40s. West winds 10 to 15 mph, becoming northwest 15 to 25 mph after midnight. Chance of rain 60%.
Friday... Mostly sunny and breezy. Much cooler with highs in the upper 50s.
Friday Night... Partly cloudy in the evening, then becoming clear. Areas of frost after midnight. Cooler with lows in the lower 30s.
Saturday... Areas of frost in the morning. Sunny. Highs in the lower 60s.
Saturday Night... Clear. Lows in the upper 30s.
Sunday... Sunny. Highs in the upper 60s.
Sunday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 40s.
Monday... Mostly cloudy. Highs around 70. Lows in the upper 40s.
Monday Night... Mostly cloudy. Highs around 70. Lows in the upper 40s.
POP = Probability of Precipitation
Monticello Radar Loop
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