National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

De Kalb Taylor Municipal Airport (KDKB)

Lat: 41.93°NLon: 88.71°WElev: 909ft.

Partly Cloudy

44°F

7°C

Humidity 38%
Wind Speed S 10 mph
Barometer 30.33 in
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 24 Mar 12:35 pm CDT
Extended Forecast for

Cortland IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 51. South wind around 10 mph, with gusts as high as 15 mph.

    High: 51 °F

    Mostly Cloudy

  • Tonight

    Tonight: Partly cloudy, with a low around 36. Southeast wind around 5 mph, with gusts as high as 10 mph.

    Low: 36 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 69. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 25 mph.

    High: 69 °F

    Partly Sunny
    then Partly
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 52. South wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 52 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 77. South southwest wind 5 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 50%.

    High: 77 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.

    Low: 30 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 51. South wind around 10 mph, with gusts as high as 15 mph.
Tonight
Partly cloudy, with a low around 36. Southeast wind around 5 mph, with gusts as high as 10 mph.
Wednesday
Partly sunny, with a high near 69. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly cloudy, with a low around 52. South wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 77. South southwest wind 5 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 45.
Friday Night
Mostly clear, with a low around 25.
Saturday
Sunny, with a high near 52.
Saturday Night
Partly cloudy, with a low around 34.
Sunday
Partly sunny, with a high near 58.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cortland IL
 41.92°N 88.67°W
Last Update:
12:11 pm CDT Mar 24, 2026
Forecast Valid:
12pm CDT Mar 24, 2026-6pm CDT Mar 30, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation