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.

Mostly Cloudy

79°F

26°C

Humidity 77%
Wind Speed SE 12 mph
Barometer 30.09 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 14 Aug 2:35 pm CDT
Extended Forecast for

Cortland IL

Flood Watch August 14, 10:00pm until August 15, 10:00am
Click here for hazard details and duration
Flood Watch

  • This Afternoon

    This Afternoon: A 20 percent chance of showers. Mostly cloudy, with a high near 78. East wind around 10 mph, with gusts as high as 15 mph.

    High: 78 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Low around 67. East wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 67 °F

    Chance
    Showers then
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 1pm. High near 84. Heat index values as high as 95. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 84 °F

    Showers then
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71. West wind around 5 mph, with gusts as high as 15 mph.

    Low: 71 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. West northwest wind around 10 mph, with gusts as high as 15 mph.

    High: 83 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers. Mostly cloudy, with a high near 78. East wind around 10 mph, with gusts as high as 15 mph.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Low around 67. East wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 1pm. High near 84. Heat index values as high as 95. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71. West wind around 5 mph, with gusts as high as 15 mph.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. West northwest wind around 10 mph, with gusts as high as 15 mph.
Sunday Night
Mostly clear, with a low around 62.
Monday
Sunny, with a high near 79.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Mostly sunny, with a high near 80.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65.
Wednesday
A chance of showers. Mostly cloudy, with a high near 79.
Wednesday Night
Partly cloudy, with a low around 60.
Thursday
Mostly sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cortland IL
 41.92°N 88.7°W
Last Update:
2:40 pm CDT Aug 14, 2026
Forecast Valid:
2pm CDT Aug 14, 2026-6pm CDT Aug 20, 2026
 
Forecast Discussion
 
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Additional Resources

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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