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Flagg, Illinois Weather Forecast
Flagg, Illinois Weather
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Weather Forecast for Flagg, Illinois : Ogle County
Issued: 3:31 pm CST Dec 18, 2025 Latitude: 41.895863 Longitude: -89.1409303 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Friday Saturday Sunday Monday Tuesday Wednesday Christmas Day
20% chance of snow on This Afternoon 50% chance of snow on Tonight Mostly Sunny on Friday Mostly Cloudy on Saturday Sunny on Sunday Mostly Cloudy on Monday Partly Sunny on Tuesday Mostly Cloudy on Wednesday Partly Sunny on Christmas Day
High: 31°F Low: 10°F High: 22°F High: 41°F High: 28°F High: 38°F High: 47°F High: 48°F High: 52°F
Low: 20°F Low: 14°F Low: 19°F Low: 32°F Low: 32°F Low: 39°F  
Snow Snow Mostly Sunny Mostly Cloudy Sunny Mostly Cloudy Partly Sunny Mostly Cloudy Partly Sunny
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Current Conditions at
ROCKFORD - (KRFD)
32°
Feels like 19°F
Mostly Cloudy
as of 4:54 PM CST
Rel. Humidity: 74%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.45 in.
Flight Rule: VFR
Wind Data
21 MPH
Gust: 36 MPH
250° West
Cloud Level(s): Few at 2500ft, Few at 5500ft, Broken at 19000ft
Current Conditions at
DE KALB TAYLOR MUNICIPAL - (KDKB)
34°
Feels like 23°F
Mostly Cloudy
as of 4:55 PM CST
Rel. Humidity: 100%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 29.44 in.
Flight Rule: VFR
Wind Data
17 MPH
Gust: 28 MPH
270° West
Cloud Level(s): Scattered at 1400ft, Scattered at 2300ft, Broken at 3100ft
Current Conditions at
STERLING ROCK - (KSQI)
28°
Feels like 12°F
Partly Cloudy
as of 4:56 PM CST
Rel. Humidity: 79%
Dew Point: 23°F
Visibility: 10 Miles
Pressure: 29.50 in.
Flight Rule: VFR
Wind Data
32 MPH
Gust: 39 MPH
270° West
Cloud Level(s): Scattered at 2200ft
20% chance of snow This Afternoon This Afternoon... Isolated snow showers. Mostly cloudy, with a steady temperature around 31. Breezy, with a west wind around 20 mph, with gusts as high as 35 mph. Chance of precipitation is 20%.

50% chance of snow Tonight Tonight... Scattered snow showers or flurries before 1am, then scattered flurries between 1am and 2am. Cloudy, with a low around 10. Wind chill values as low as -9. Breezy, with a west wind around 25 mph, with gusts as high as 40 mph. Chance of precipitation is 50%.

Mostly Sunny on Friday Friday... Mostly sunny, with a high near 22. Wind chill values as low as -9. Blustery, with a west northwest wind 15 to 25 mph becoming south southwest 5 to 10 mph in the afternoon. Winds could gust as high as 35 mph.

Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 20. South wind 5 to 15 mph, with gusts as high as 25 mph.

Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 41. South wind 10 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph.

Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 14.

Sunny on Sunday Sunday... Sunny, with a high near 28.

Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 19.

Mostly Cloudy on Monday Monday... Mostly cloudy, with a high near 38.

Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 32.

Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 47.

Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 32.

Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 48.

Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 39.

Partly Sunny on Christmas Day Christmas Day... Partly sunny, with a high near 52.

Current Radar Image


Sun Almanac for Flagg, Illinois
Sunrise: 07:20 AM
Sunset: 4:27 PM
Civil Sunrise:06:48 AM
Civil Sunset: 4:59 PM
Nautical Sunrise: 06:13 AM
Nautical Sunset: 5:34 PM
Astro Sunrise: 05:39 AM
Astro Sunset: 6:08 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.