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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Rantoul National Aviation Center Airport (KTIP)

Lat: 40.29°NLon: 88.15°WElev: 732ft.

Partly Cloudy

79°F

26°C

Humidity 70%
Wind Speed E 8 mph
Barometer 29.95 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 20 Sep 11:15 am CDT
Extended Forecast for

Cissna Park IL

  • Today

    Today: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 79. North wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 79 °F

    Showers
    Likely

  • Tonight

    Tonight: A 40 percent chance of showers, mainly after 2am. Cloudy, with a low around 58. East northeast wind 10 to 15 mph.

    Low: 58 °F

    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers, mainly before 10am. Mostly cloudy, with a high near 68. East northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 68 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 53. Northeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 53 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 65. Northeast wind around 10 mph, with gusts as high as 15 mph.

    High: 65 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 67.

    High: 67 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 69.

    High: 69 °F

    Partly Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 79. North wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
A 40 percent chance of showers, mainly after 2am. Cloudy, with a low around 58. East northeast wind 10 to 15 mph.
Monday
A 40 percent chance of showers, mainly before 10am. Mostly cloudy, with a high near 68. East northeast wind around 10 mph, with gusts as high as 20 mph.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 53. Northeast wind around 10 mph, with gusts as high as 15 mph.
Tuesday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 65. Northeast wind around 10 mph, with gusts as high as 15 mph.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Partly sunny, with a high near 67.
Wednesday Night
Mostly cloudy, with a low around 50.
Thursday
Partly sunny, with a high near 69.
Thursday Night
Mostly cloudy, with a low around 51.
Friday
Partly sunny, with a high near 70.
Friday Night
Partly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cissna Park IL
 40.57°N 87.88°W
Last Update:
10:21 am CDT Sep 20, 2026
Forecast Valid:
11am CDT Sep 20, 2026-6pm CDT Sep 26, 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