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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Fair

N/A

Humidity NA
Wind Speed Calm
Barometer 30.16 in
Dewpoint N/A
Visibility 7.00 mi
Last update 28 Aug 8:15 am CDT
Extended Forecast for

Mendota IL

  • Today

    Today: Sunny, with a high near 81. Calm wind becoming west around 5 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. Calm wind becoming southwest around 5 mph.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Partly sunny, with a high near 79. South wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 79 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 66. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 66 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 86. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 86 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 81. Calm wind becoming west around 5 mph.
Tonight
Mostly clear, with a low around 60. Calm wind becoming southwest around 5 mph.
Saturday
Partly sunny, with a high near 79. South wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday Night
Mostly cloudy, with a low around 66. South wind around 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 86. South wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 88.
Monday Night
Partly cloudy, with a low around 72.
Tuesday
Mostly sunny, with a high near 89.
Tuesday Night
A chance of showers after 1am. Partly cloudy, with a low around 70.
Wednesday
Sunny, with a high near 89.
Wednesday Night
Mostly clear, with a low around 70.
Thursday
Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mendota IL
 41.56°N 89.13°W
Last Update:
1:21 am CDT Aug 28, 2026
Forecast Valid:
8am CDT Aug 28, 2026-6pm CDT Sep 3, 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