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City of Sycamore, ILSycamore, IL 7-Day Night Weather Forecast
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Sycamore, IL Weather Forecast
Sycamore, IL Weather Forecast Date: 251 PM CDT Fri Sep 18 2026
The area/counties/county of: De Kalb, including the cities of: Dekalb and Sycamore.or toggle through each period.
Late This Afternoon... Mostly cloudy. A chance of showers. Temperatures in the lower 70s. East winds 10 to 15 mph. Chance of precipitation 50%.
Tonight... Mostly cloudy. A slight chance of showers early in the evening. A chance of showers and thunderstorms after midnight. Lows in the lower 60s. East winds around 10 mph. Chance of precipitation 50%.
Saturday... Mostly cloudy. Showers with thunderstorms likely in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Southeast winds 10 to 15 mph, becoming south 5 to 10 mph in the afternoon. Chance of precipitation 90%.
Saturday Night... Thunderstorms likely until early morning. Showers. A chance of thunderstorms late. Humid with lows in the lower 60s. Southeast winds around 5 mph, becoming north after midnight. Chance of precipitation 80%.
Sunday... Showers likely with a slight chance of thunderstorms. Breezy with highs in the upper 60s. Northeast winds 10 to 15 mph, increasing to 15 to 20 mph in the afternoon. Gusts up to 30 mph. Chance of precipitation 70%.
Sunday Night... Mostly cloudy. A chance of showers. Lows in the mid 50s. Northeast winds 15 to 20 mph with gusts up to 25 mph, diminishing to 10 to 15 mph after midnight. Chance of precipitation 50%.
Monday... Cloudy with a 50% chance of showers. Breezy with highs in the mid 60s.
Monday Night... Mostly cloudy with a 40% chance of showers. Lows in the lower 50s.
Tuesday... Mostly cloudy. Highs in the lower 60s.
Tuesday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the upper 40s.
Wednesday... Mostly cloudy. Highs in the mid 60s.
Wednesday Night... Partly cloudy. Lows around 50.
Thursday... Mostly cloudy. Highs in the upper 60s.
Thursday Night... Partly cloudy. Lows in the lower 50s.
POP = Probability of Precipitation
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