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

Thunderstorms and Widespread Rainfall Across the Southern Plains

Isolated severe thunderstorms and widespread showers may produce flash flooding across the Southern Plains through Thursday. Numerous instances of flash flooding are expected in south-central Texas, including portions of the Hill Country; and an additional area across eastern Oklahoma into the Ozarks on Thursday. Heavy rainfall and mountain snow will return to southern California on Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Fog/Mist

44°F

7°C

Humidity 99%
Wind Speed SE 5 mph
Barometer 30.10 in
Dewpoint 44°F (7°C)
Visibility 1.75 mi
Wind Chill41°F (5°C)
Last update 20 Nov 5:35 am CST
Extended Forecast for

Ottawa IL

  • Overnight

    Overnight: Patchy drizzle and fog. Cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy
    Drizzle and
    Patchy Fog

  • Thursday

    Thursday: Patchy drizzle and fog before 9am. Cloudy, with a high near 50. Calm wind becoming south around 5 mph.

    High: 50 °F

    Patchy
    Drizzle and
    Patchy Fog
    then Cloudy

  • Thursday Night

    Thursday Night: Cloudy, with a steady temperature around 47. Calm wind becoming north northeast around 5 mph.

    Low: 47 °F

    Cloudy

  • Friday

    Friday: A 30 percent chance of rain, mainly after noon. Cloudy, with a high near 52. North northeast wind 5 to 10 mph.

    High: 52 °F

    Chance Rain

  • Friday Night

    Friday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 32. North northeast wind around 5 mph, with gusts as high as 10 mph.

    Low: 32 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy drizzle and fog. Cloudy, with a low around 42. Calm wind.
Thursday
Patchy drizzle and fog before 9am. Cloudy, with a high near 50. Calm wind becoming south around 5 mph.
Thursday Night
Cloudy, with a steady temperature around 47. Calm wind becoming north northeast around 5 mph.
Friday
A 30 percent chance of rain, mainly after noon. Cloudy, with a high near 52. North northeast wind 5 to 10 mph.
Friday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 32. North northeast wind around 5 mph, with gusts as high as 10 mph.
Saturday
Sunny, with a high near 50.
Saturday Night
Mostly clear, with a low around 36.
Sunday
Sunny, with a high near 58.
Sunday Night
Partly cloudy, with a low around 36.
Monday
A chance of rain after noon. Partly sunny, with a high near 54.
Monday Night
Rain likely. Mostly cloudy, with a low around 43.
Tuesday
A chance of rain. Mostly cloudy, with a high near 54.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Partly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ottawa IL
 41.35°N 88.85°W
Last Update:
3:25 am CST Nov 20, 2025
Forecast Valid:
5am CST Nov 20, 2025-6pm CST Nov 26, 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