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Dayton, Illinois Weather Forecast
Dayton, Illinois Weather
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Weather Forecast for Dayton, Illinois : LaSalle County
Issued: 9:11 am CST Jan 21, 2026 Latitude: 41.3847551 Longitude: -88.7942425 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Thursday Friday Saturday Sunday Monday Tuesday
20% chance of snow on Today 50% chance of snow on Tonight 20% chance of snow on Thursday Mostly Sunny on Friday 20% chance of snow on Saturday Partly Sunny on Sunday Sunny on Monday Mostly Sunny on Tuesday
High: 34°F Low: 14°F High: 26°F High: -1°F High: 8°F High: 15°F High: 16°F High: 26°F
Low: -7°F Low: -8°F Low: 2°F Low: 0°F Low: 6°F  
Snow Snow Snow Mostly Sunny Snow Partly Sunny Sunny Mostly Sunny
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Current Conditions at
PERU - (KVYS)
28°
Feels like 17°F
Partly Cloudy
as of 9:39 AM CST
Rel. Humidity: 74%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: VFR
Wind Data
13 MPH
Gust: 18 MPH
280° West
Cloud Level(s): Scattered at 1400ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
30°
Feels like 19°F
Cloudy
as of 9:35 AM CST
Rel. Humidity: 63%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 29.95 in.
Flight Rule: MVFR
Wind Data
15 MPH
280° West
Cloud Level(s): Solid Overcast at 3000ft
Current Conditions at
PONTIAC MUNICIPAL AIRPT - (KPNT)
32°
Feels like 20°F
Clear
as of 9:35 AM CST
Rel. Humidity: 59%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 29.97 in.
Flight Rule: VFR
Wind Data
20 MPH
270° West
Cloud Level(s): Clear
20% chance of snow Today Today... A 20 percent chance of snow showers after 5pm. Partly sunny, with a high near 34. West southwest wind around 15 mph, with gusts as high as 25 mph.
50% chance of snow Tonight Tonight... A 50 percent chance of snow showers, mainly before 9pm. Mostly cloudy, with a low around 14. Wind chill values as low as zero. Breezy, with a west northwest wind 20 to 25 mph decreasing to 15 to 20 mph. Winds could gust as high as 40 mph.
20% chance of snow Thursday Thursday... A 20 percent chance of snow showers after 3pm. Mostly sunny, with a high near 26. Wind chill values as low as zero. West wind 10 to 15 mph, with gusts as high as 25 mph.
20% chance of snow Thursday Night Thursday Night... A 20 percent chance of snow showers before 9pm. Mostly cloudy, with a low around -7. Wind chill values as low as -26. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 25 mph.
Mostly Sunny on Friday Friday... Mostly sunny and cold, with a high near -1. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around -8.
20% chance of snow Saturday Saturday... A 20 percent chance of snow after noon. Mostly cloudy and cold, with a high near 8.
20% chance of snow Saturday Night Saturday Night... A chance of snow. Mostly cloudy, with a low around 2.
Partly Sunny on Sunday Sunday... Partly sunny, with a high near 15.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 0.
Sunny on Monday Monday... Sunny, with a high near 16.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 6.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 26.
Current Radar Image


Sun Almanac for Dayton, Illinois
Sunrise: 07:15 AM
Sunset: 4:58 PM
Civil Sunrise:06:45 AM
Civil Sunset: 5:28 PM
Nautical Sunrise: 06:12 AM
Nautical Sunset: 6:01 PM
Astro Sunrise: 05:39 AM
Astro Sunset: 6:34 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.