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

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Fair

57°F

14°C

Humidity 94%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 30 Jul 3:18 am CDT
Extended Forecast for

Mendota IL

  • Overnight

    Overnight: Patchy fog. Otherwise, mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming south around 5 mph in the morning.

    High: 84 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 63. South southeast wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Partly Cloudy

  • Friday

    Friday: Showers and thunderstorms likely, mainly before 4pm, then showers likely and possibly a thunderstorm after 5pm. Increasing clouds, with a high near 74. South southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    High: 74 °F

    Partly Sunny
    then Showers
    Likely

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 7pm, then rain and possibly a thunderstorm between 7pm and 1am, then rain after 1am. Some of the storms could produce heavy rainfall. Low around 64. East northeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 64 °F

    Heavy Rain

  • Saturday

    Saturday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 76. Chance of precipitation is 60%.

    High: 76 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly clear, with a low around 59. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming south around 5 mph in the morning.
Thursday Night
Partly cloudy, with a low around 63. South southeast wind around 5 mph becoming calm in the evening.
Friday
Showers and thunderstorms likely, mainly before 4pm, then showers likely and possibly a thunderstorm after 5pm. Increasing clouds, with a high near 74. South southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Friday Night
Showers and possibly a thunderstorm before 7pm, then rain and possibly a thunderstorm between 7pm and 1am, then rain after 1am. Some of the storms could produce heavy rainfall. Low around 64. East northeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 76. Chance of precipitation is 60%.
Saturday Night
Partly cloudy, with a low around 61.
Sunday
Sunny, with a high near 79.
Sunday Night
Mostly clear, with a low around 60.
Monday
Sunny, with a high near 81.
Monday Night
Mostly clear, with a low around 63.
Tuesday
Sunny, with a high near 83.
Tuesday Night
Mostly clear, with a low around 65.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 84.
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ABOUT THIS FORECAST

 
Point Forecast:
Mendota IL
 41.56°N 89.13°W
Last Update:
1:11 am CDT Jul 30, 2026
Forecast Valid:
3am CDT Jul 30, 2026-6pm CDT Aug 5, 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