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

Hazardous Weather Conditions

Current conditions at

Jacksonville Municipal Airport (KIJX)

Lat: 39.77°NLon: 90.24°WElev: 614ft.

Fair

76°F

24°C

Humidity 78%
Wind Speed S 6 mph
Barometer 29.99 in
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 1 Sep 3:15 am CDT
Extended Forecast for

Jacksonville IL

Heat Advisory September 1, 03:39am until September 3, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 1, 03:39am until September 3, 07:00pm

    NOW until 7:00pm Thu

    Heat Advisory

  • Overnight

    Low: 72 °F

    Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Heat index values as high as 104. South southwest wind 6 to 8 mph, with gusts as high as 15 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 77. South wind 5 to 7 mph, with gusts as high as 15 mph.

    Low: 77 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 99. Heat index values as high as 104. Southwest wind 7 to 10 mph, with gusts as high as 17 mph.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 78. South wind 5 to 7 mph.

    Low: 78 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 98. Southwest wind 6 to 8 mph.

    High: 98 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 77. South wind 3 to 5 mph.

    Low: 77 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

Detailed Forecast

Overnight
Clear, with a low around 72. South southwest wind around 8 mph, with gusts as high as 15 mph.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 104. South southwest wind 6 to 8 mph, with gusts as high as 15 mph.
Tuesday Night
Mostly clear, with a low around 77. South wind 5 to 7 mph, with gusts as high as 15 mph.
Wednesday
Sunny and hot, with a high near 99. Heat index values as high as 104. Southwest wind 7 to 10 mph, with gusts as high as 17 mph.
Wednesday Night
Mostly clear, with a low around 78. South wind 5 to 7 mph.
Thursday
Sunny and hot, with a high near 98. Southwest wind 6 to 8 mph.
Thursday Night
Mostly clear, with a low around 77. South wind 3 to 5 mph.
Friday
Sunny and hot, with a high near 98.
Friday Night
Partly cloudy, with a low around 74.
Saturday
Mostly sunny and hot, with a high near 97.
Saturday Night
A chance of showers. Partly cloudy, with a low around 71.
Sunday
Mostly sunny, with a high near 93.
Sunday Night
Partly cloudy, with a low around 68.
Labor Day
Mostly sunny, with a high near 89.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Jacksonville IL
 39.73°N 90.21°W (Elev. 581 ft)
Last Update:
3:35 am CDT Sep 1, 2026
Forecast Valid:
3am CDT Sep 1, 2026-6pm CDT Sep 7, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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