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South Ottawa, Illinois Weather Forecast
South Ottawa, Illinois Weather
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Weather Forecast for South Ottawa, Illinois : LaSalle County
Issued: 4:05 am CST Dec 21, 2025 Latitude: 41.3317004 Longitude: -88.8370212 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Monday Tuesday Wednesday Christmas Day Friday Saturday
Sunny on Today Increasing Clouds on Tonight Mostly Cloudy on Monday Partly Sunny on Tuesday 30% chance of rain on Wednesday Cloudy on Christmas Day Mostly Cloudy on Friday Mostly Cloudy on Saturday
High: 34°F Low: 27°F High: 42°F High: 47°F High: 48°F High: 54°F High: 44°F High: 44°F
Low: 37°F Low: 32°F Low: 46°F Low: 39°F Low: 32°F  
Sunny Increasing Clouds Mostly Cloudy Partly Sunny Rain Cloudy Mostly Cloudy Mostly Cloudy
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Current Conditions at
PERU - (KVYS)
21°
Clear
as of 4:15 AM CST
Rel. Humidity: 67%
Dew Point: 12°F
Visibility: 10 Miles
Pressure: 30.32 in.
Flight Rule: VFR
Wind Data
7 MPH
320° Northwest
Cloud Level(s): Clear
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
21°
Clear
as of 4:15 AM CST
Rel. Humidity: 67%
Dew Point: 12°F
Visibility: 10 Miles
Pressure: 30.31 in.
Flight Rule: VFR
Wind Data
5 MPH
350° North
Cloud Level(s): Clear
Current Conditions at
PONTIAC MUNICIPAL AIRPT - (KPNT)
21°
Clear
as of 4:15 AM CST
Rel. Humidity: 73%
Dew Point: 14°F
Visibility: 10 Miles
Pressure: 30.31 in.
Flight Rule: VFR
Wind Data
7 MPH
310° Northwest
Cloud Level(s): Clear
Current Conditions at
LACON/MARSHALL COUNTY - (KC75)
19°
Clear
as of 4:15 AM CST
Rel. Humidity: 67%
Dew Point: 10°F
Visibility: 10 Miles
Pressure: 30.32 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Sunny on Today Today... Sunny, with a high near 34. North northwest wind around 5 mph becoming calm. Winds could gust as high as 10 mph.
Increasing Clouds on Tonight Tonight... Increasing clouds, with a steady temperature around 27. South wind 5 to 10 mph.
Mostly Cloudy on Monday Monday... Mostly cloudy, with a high near 42. South wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 37. Southwest wind around 10 mph, with gusts as high as 15 mph.
Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 47. West southwest wind 5 to 10 mph becoming north northwest in the afternoon.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 32.
30% chance of rain Wednesday Wednesday... A 30 percent chance of showers or drizzle after noon. Cloudy, with a high near 48.
20% chance of rain Wednesday Night Wednesday Night... A chance of showers or drizzle before midnight. Cloudy, with a low around 46.
Cloudy on Christmas Day Christmas Day... Cloudy, with a high near 54.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 39.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 44.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 32.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 44.
Current Radar Image


Sun Almanac for South Ottawa, Illinois
Sunrise: 07:18 AM
Sunset: 4:29 PM
Civil Sunrise:06:47 AM
Civil Sunset: 5:01 PM
Nautical Sunrise: 06:12 AM
Nautical Sunset: 5:35 PM
Astro Sunrise: 05:38 AM
Astro Sunset: 6:09 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.