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.

Partly Cloudy

79°F

26°C

Humidity 65%
Wind Speed E 8 mph
Barometer 29.91 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 27 Jun 7:04 pm CDT
Extended Forecast for

Ottawa IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 66. East wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 66 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 86. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 86 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 76. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 93. Heat index values as high as 105. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 66. East wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday
Mostly sunny, with a high near 86. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Increasing clouds, with a low around 76. South southeast wind around 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 93. Heat index values as high as 105. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 76. South wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 92.
Tuesday Night
Mostly clear, with a low around 78.
Wednesday
Sunny, with a high near 94.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
A chance of showers after 1pm. Sunny, with a high near 93.
Thursday Night
Partly cloudy, with a low around 75.
Friday
A chance of showers and thunderstorms. Sunny, with a high near 92.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Independence Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ottawa IL
 41.35°N 88.85°W
Last Update:
4:56 pm CDT Jun 27, 2026
Forecast Valid:
7pm CDT Jun 27, 2026-6pm CDT Jul 4, 2026
 
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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

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation