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Boone County, IL Weather Forecast
Boone County, IL Weather Forecast Date: 829 PM CST Mon Mar 02 2026
The area/counties/county of: Boone, including the city of Belvidere.or toggle through each period.
Rest of Tonight... Mostly cloudy. A slight chance of rain and freezing rain late. Near steady temperature in the lower 30s. Southeast winds around 5 mph. Chance of precipitation 20%.
Tuesday... Mostly cloudy. A slight chance of rain and freezing rain early in the morning, then a chance of rain late in the morning. A slight chance of rain in the afternoon. Highs in the mid 40s. East winds around 5 mph. Chance of precipitation 30%.
Tuesday Night... Partly cloudy. A slight chance of rain showers after midnight. Lows around 30. East winds around 5 mph. Chance of precipitation 20%.
Wednesday... Partly cloudy in the morning, then becoming mostly cloudy. A slight chance of rain showers in the morning, then a chance of rain showers in the afternoon. Highs in the lower 50s. East winds 5 to 10 mph. Chance of precipitation 30%.
Wednesday Night... Mostly cloudy. A chance of showers. Lows in the upper 30s. East winds around 5 mph. Chance of precipitation 50%.
Thursday... Showers likely. Highs in the mid 50s. Chance of precipitation 70%.
Thursday Night... Mostly cloudy with a 20% chance of showers. Lows in the lower 40s.
Friday... Showers. Highs in the mid 60s. Chance of precipitation 80%.
Friday Night... Showers with a chance of thunderstorms. Lows in the lower 50s. Chance of precipitation 80%.
Saturday... Mostly cloudy. A chance of showers in the morning. Highs in the lower 60s. Temperature falling into the mid 50s in the afternoon. Chance of precipitation 40%.
Saturday Night... Mostly cloudy. Lows in the upper 30s.
Sunday... Partly cloudy. Highs around 60.
Sunday Night... Mostly clear. Lows in the lower 40s.
POP = Probability of Precipitation
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