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

Hazardous Weather Conditions

Current conditions at

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Overcast

31°F

-1°C

Humidity 91%
Wind Speed SW 3 mph
Barometer 29.91 in
Dewpoint 29°F (-2°C)
Visibility 7.00 mi
Last update 6 Dec 7:35 am CST
Extended Forecast for

Ottawa IL

Winter Weather Advisory December 6, 09:00pm until December 7, 06:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Today

    Today: Mostly cloudy, with a high near 30. West wind around 5 mph becoming calm in the afternoon.

    High: 30 °F

    Mostly Cloudy

  • Tonight

    Tonight: Snow before 4am, then snow, possibly mixed with freezing rain. Low around 25. East southeast wind 5 to 10 mph becoming northeast after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of 1 to 3 inches possible.

    Low: 25 °F

    Chance Snow
    then Wintry
    Mix

  • Sunday

    Sunday: A 40 percent chance of snow before noon. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 18 by 5pm. North wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 27 °F⇓

    Chance Snow
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 6. Wind chill values as low as -3. North wind 5 to 10 mph becoming light north northeast after midnight. Winds could gust as high as 15 mph.

    Low: 6 °F

    Increasing
    Clouds

  • Monday

    Monday: Partly sunny, with a high near 21. Calm wind becoming south around 5 mph in the afternoon. Winds could gust as high as 10 mph.

    High: 21 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 37.

    High: 37 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Rain likely. Cloudy, with a low around 31.

    Low: 31 °F

    Rain Likely

  • Wednesday

    Wednesday: A chance of rain before noon, then a chance of snow. Mostly cloudy, with a high near 34.

    High: 34 °F

    Chance Rain
    then Chance
    Snow

Detailed Forecast

Today
Mostly cloudy, with a high near 30. West wind around 5 mph becoming calm in the afternoon.
Tonight
Snow before 4am, then snow, possibly mixed with freezing rain. Low around 25. East southeast wind 5 to 10 mph becoming northeast after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of 1 to 3 inches possible.
Sunday
A 40 percent chance of snow before noon. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 18 by 5pm. North wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Increasing clouds, with a low around 6. Wind chill values as low as -3. North wind 5 to 10 mph becoming light north northeast after midnight. Winds could gust as high as 15 mph.
Monday
Partly sunny, with a high near 21. Calm wind becoming south around 5 mph in the afternoon. Winds could gust as high as 10 mph.
Monday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 10.
Tuesday
Mostly cloudy, with a high near 37.
Tuesday Night
Rain likely. Cloudy, with a low around 31.
Wednesday
A chance of rain before noon, then a chance of snow. Mostly cloudy, with a high near 34.
Wednesday Night
Mostly cloudy, with a low around 15.
Thursday
A chance of snow. Mostly cloudy, with a high near 24.
Thursday Night
Mostly cloudy, with a low around 11.
Friday
Partly sunny, with a high near 18.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ottawa IL
 41.35°N 88.85°W
Last Update:
6:16 am CST Dec 6, 2025
Forecast Valid:
7am CST Dec 6, 2025-6pm CST Dec 12, 2025
 
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