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

Hazardous Weather Conditions

Current conditions at

De Kalb Taylor Municipal Airport (KDKB)

Lat: 41.93°NLon: 88.71°WElev: 909ft.

Fair

32°F

0°C

Humidity 90%
Wind Speed Calm
Barometer 30.11 in
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 2 May 3:55 am CDT
Extended Forecast for

Cortland IL

Frost Advisory May 2, 04:13am until May 2, 08:00am
Click here for hazard details and duration
...
  •  
    Frost Advisory May 2, 04:13am until May 2, 08:00am

    NOW until 8:00am Sat

    Frost Advisory

  • Today

    High: 55 °F

    Frost then
    Mostly Sunny

  • Tonight

    Tonight: A 20 percent chance of showers after 4am. Partly cloudy, with a low around 41. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 41 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers, mainly between 7am and 1pm. Partly sunny, with a high near 66. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 66 °F

    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44. West wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after 4pm. Sunny, with a high near 74. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 74 °F

    Sunny then
    Slight Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 47. Chance of precipitation is 50%.

    Low: 47 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers. Mostly cloudy, with a high near 57.

    High: 57 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers before 1am. Mostly cloudy, with a low around 39.

    Low: 39 °F

    Chance
    Showers

Detailed Forecast

Today
Widespread frost, mainly before 7am. Otherwise, mostly sunny, with a high near 55. West wind 5 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 15 mph.
Tonight
A 20 percent chance of showers after 4am. Partly cloudy, with a low around 41. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday
A 40 percent chance of showers, mainly between 7am and 1pm. Partly sunny, with a high near 66. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph.
Sunday Night
Mostly clear, with a low around 44. West wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
A 20 percent chance of showers after 4pm. Sunny, with a high near 74. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 47. Chance of precipitation is 50%.
Tuesday
A 50 percent chance of showers. Mostly cloudy, with a high near 57.
Tuesday Night
A chance of showers before 1am. Mostly cloudy, with a low around 39.
Wednesday
Mostly cloudy, with a high near 55.
Wednesday Night
Mostly cloudy, with a low around 38.
Thursday
Partly sunny, with a high near 57.
Thursday Night
Partly cloudy, with a low around 39.
Friday
Mostly sunny, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cortland IL
 41.92°N 88.7°W
Last Update:
3:30 am CDT May 2, 2026
Forecast Valid:
4am CDT May 2, 2026-6pm CDT May 8, 2026
 
Forecast Discussion
 
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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