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

62°F

17°C

Humidity 100%
Wind Speed N 3 mph
Barometer 29.96 in
Dewpoint 62°F (17°C)
Visibility 7.00 mi
Last update 14 Oct 4:35 am CDT
Extended Forecast for

Cortland IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Cloudy, with a steady temperature around 64. North wind around 5 mph.

    Low: 64 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A 10 percent chance of showers and thunderstorms before 7am. Mostly cloudy, with a high near 65. North northeast wind around 10 mph.

    High: 65 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 54. Northeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 54 °F

    Mostly Cloudy

  • Thursday

    Thursday: Rain, with thunderstorms also possible after 1pm. High near 59. East southeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%.

    High: 59 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely and possibly a thunderstorm before 1am, then a slight chance of rain. Mostly cloudy, with a low around 46. Northeast wind 5 to 10 mph becoming northwest 10 to 15 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.

    Low: 46 °F

    Rain Likely

  • Friday

    Friday: A 20 percent chance of rain before 1pm. Partly sunny, with a high near 53. Breezy.

    High: 53 °F

    Slight Chance
    Rain and
    Breezy

  • Friday Night

    Friday Night: Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear
    then Frost

  • Saturday

    Saturday: Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 55.

    High: 55 °F

    Frost then
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Cloudy, with a steady temperature around 64. North wind around 5 mph.
Wednesday
A 10 percent chance of showers and thunderstorms before 7am. Mostly cloudy, with a high near 65. North northeast wind around 10 mph.
Wednesday Night
Mostly cloudy, with a low around 54. Northeast wind around 10 mph, with gusts as high as 15 mph.
Thursday
Rain, with thunderstorms also possible after 1pm. High near 59. East southeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%.
Thursday Night
Rain likely and possibly a thunderstorm before 1am, then a slight chance of rain. Mostly cloudy, with a low around 46. Northeast wind 5 to 10 mph becoming northwest 10 to 15 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.
Friday
A 20 percent chance of rain before 1pm. Partly sunny, with a high near 53. Breezy.
Friday Night
Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 33.
Saturday
Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 55.
Saturday Night
Clear, with a low around 39.
Sunday
Sunny, with a high near 66.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Partly sunny, with a high near 68.
Monday Night
Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cortland IL
 41.92°N 88.7°W
Last Update:
2:41 am CDT Oct 14, 2026
Forecast Valid:
4am CDT Oct 14, 2026-6pm CDT Oct 20, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation