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

78°F

26°C

Humidity 97%
Wind Speed SW 13 mph
Barometer 29.97 in
Dewpoint 77°F (25°C)
Visibility 7.00 mi
Heat Index81°F (27°C)
Last update 30 Jun 7:35 am CDT
Extended Forecast for

Cortland IL

Extreme Heat Warning June 30, 07:49am until July 3, 12:00am
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 30, 07:49am until July 3, 12:00am

    NOW until 12:00am Fri

    Extreme Heat Warning

  • Today

    High: 92 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 75. South southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 93. Heat index values as high as 103. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 92. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 92 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 73. Chance of precipitation is 60%.

    Low: 73 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Chance of precipitation is 60%.

    High: 90 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 92. Heat index values as high as 104. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Tonight
Mostly clear, with a low around 75. South southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Wednesday
Sunny, with a high near 93. Heat index values as high as 103. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 76. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 92. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 73. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Chance of precipitation is 60%.
Friday Night
A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 70.
Independence Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 66.
Monday
Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cortland IL
 41.92°N 88.7°W
Last Update:
7:46 am CDT Jun 30, 2026
Forecast Valid:
7am CDT Jun 30, 2026-6pm CDT Jul 6, 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