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

Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

Flash flooding threatens areas from the Tennessee Valley to the Carolinas as storms repeat along a stalled front. Monsoonal storms may trigger flooding in the Southwest. Dangerous heat expands across the Desert Southwest, Plains, mid-Mississippi Valley and Southern Tier. Critical fire weather for interior Pacific Northwest. Cooler, drier air brings brief relief to the Great Lakes and Northeast. Read More >

Current conditions at

Pontiac Municipal Airport (KPNT)

Lat: 40.92°NLon: 88.62°WElev: 650ft.

Fair

65°F

18°C

Humidity 86%
Wind Speed NA
Barometer 30.08 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 24 Jul 8:55 pm CDT
Extended Forecast for

Sibley IL

  • Tonight

    Tonight: A 20 percent chance of showers after 4am. Increasing clouds, with a low around 60. South southeast wind around 5 mph becoming calm.

    Low: 60 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 80. South southwest wind around 5 mph, with gusts as high as 10 mph.

    High: 80 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 67. South southwest wind around 5 mph becoming calm in the evening.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 90. Heat index values as high as 103. Southwest wind around 5 mph, with gusts as high as 15 mph.

    High: 90 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. Southwest wind 5 to 10 mph.

    Low: 72 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92.

    High: 92 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 72.

    Low: 72 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers after 4am. Increasing clouds, with a low around 60. South southeast wind around 5 mph becoming calm.
Saturday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 80. South southwest wind around 5 mph, with gusts as high as 10 mph.
Saturday Night
Partly cloudy, with a low around 67. South southwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 90. Heat index values as high as 103. Southwest wind around 5 mph, with gusts as high as 15 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. Southwest wind 5 to 10 mph.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 72.
Tuesday
Sunny, with a high near 90.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Sunny, with a high near 88.
Thursday Night
Mostly clear, with a low around 67.
Friday
Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sibley IL
 40.59°N 88.38°W
Last Update:
8:46 pm CDT Jul 24, 2026
Forecast Valid:
9pm CDT Jul 24, 2026-6pm CDT Jul 31, 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