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Cortland, IL Weather Forecast
Cortland, IL Weather Forecast Date: 316 PM CST Fri Nov 13 2026
The area/counties/county of: De Kalb, including the cities of: Dekalb and Sycamore.or toggle through each period.
Late This Afternoon... Partly cloudy. Temperatures in the upper 30s. North winds around 10 mph.
Tonight... Clear. Lows in the upper 20s. North winds 5 to 10 mph.
Saturday... Sunny. Highs in the mid 40s. Northwest winds 5 to 10 mph.
Saturday Night... Clear. Lows in the upper 20s. Northwest winds around 5 mph.
Sunday... Sunny. Highs in the upper 40s. Light and variable winds, becoming northwest around 5 mph in the afternoon.
Sunday Night... Clear. Lows in the upper 20s. Light and variable winds.
Monday... Sunny. Highs around 50.
Monday Night... Clear. Lows in the upper 20s.
Tuesday... Sunny. Highs in the lower 50s.
Tuesday Night... Clear. Lows in the lower 30s.
Wednesday... Mostly sunny in the morning, then becoming partly cloudy. Highs in the mid 50s.
Wednesday Night... Partly cloudy. Lows in the lower 40s.
Thursday... Mostly cloudy. Highs in the upper 50s.
Thursday Night... Partly cloudy. Lows in the mid 40s.
POP = Probability of Precipitation
Cortland Radar Loop
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