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 >

Hazardous Weather Conditions

Current conditions at

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Mendota IL

  • Overnight

    Overnight: Mostly clear, with a low around 60. South wind around 5 mph.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Partly sunny, with a high near 80. East northeast wind 5 to 10 mph becoming southwest in the morning. Winds could gust as high as 15 mph.

    High: 80 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 10 percent chance of showers after 5am. Mostly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers before 9am. Partly sunny, with a high near 86. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 86 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69. South wind around 10 mph, with gusts as high as 15 mph.

    Low: 69 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 90.

    High: 90 °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 90.

    High: 90 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 60. South wind around 5 mph.
Saturday
Partly sunny, with a high near 80. East northeast wind 5 to 10 mph becoming southwest in the morning. Winds could gust as high as 15 mph.
Saturday Night
A 10 percent chance of showers after 5am. Mostly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 20 mph.
Sunday
A 20 percent chance of showers before 9am. Partly sunny, with a high near 86. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 69. South wind around 10 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 90.
Monday Night
Partly cloudy, with a low around 72.
Tuesday
Mostly sunny, with a high near 90.
Tuesday Night
Partly cloudy, with a low around 73.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 70.
Thursday
Mostly sunny, with a high near 87.
Thursday Night
A chance of showers. Partly cloudy, with a low around 69.
Friday
Mostly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mendota IL
 41.56°N 89.1°W
Last Update:
2:46 am CDT Aug 29, 2026
Forecast Valid:
3am CDT Aug 29, 2026-6pm CDT Sep 4, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation