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Weather Conditions for Flagg, Illinois : Ogle County
Issued: 1:20 pm CDT Oct 7, 2026 Latitude: 41.895863 Longitude: -89.1409303 View on Google Maps

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Tonight Thursday Friday Saturday Sunday Columbus Day Tuesday Wednesday
Mostly Clear on Tonight Partly Sunny on Thursday 30% chance of thunderstorms on Friday Sunny on Saturday Partly Sunny on Sunday Mostly Sunny on Columbus Day Partly Sunny on Tuesday Mostly Sunny on Wednesday
Low: 48°F High: 70°F High: 74°F High: 81°F High: 77°F High: 78°F High: 64°F High: 62°F
Low: 48°F Low: 58°F Low: 56°F Low: 56°F Low: 48°F Low: 42°F  
Mostly Clear Partly Sunny Thunderstorms Sunny Partly Sunny Mostly Sunny Partly Sunny Mostly Sunny

Hourly forecast

Flagg, il · Next 24 hours · Eastern time (EST/EDT)

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Current Conditions at
ROCHELLE MUNICIPAL ARPT - (KRPJ)
77°
Clear
as of 4:35 PM CDST
Rel. Humidity: 27%
Dew Point: 41°F
Visibility: 10 Miles
Pressure: 29.87 in.
Flight Rule: VFR
Wind Data
13 MPH
Gust: 22 MPH
320° Northwest
Cloud Level(s): Clear
Current Conditions at
ROCKFORD - (KRFD)
77°
Partly Cloudy
as of 3:54 PM CDST
Rel. Humidity: 27%
Dew Point: 41°F
Visibility: 10 Miles
Pressure: 29.86 in.
Flight Rule: VFR
Wind Data
18 MPH
Gust: 28 MPH
310° Northwest
Cloud Level(s): Scattered at 25000ft
Current Conditions at
DE KALB TAYLOR MUNICIPAL - (KDKB)
77°
Clear
as of 4:35 PM CDST
Rel. Humidity: 29%
Dew Point: 43°F
Visibility: 10 Miles
Pressure: 29.87 in.
Flight Rule: VFR
Wind Data
10 MPH
Gust: 23 MPH
310° Northwest
Cloud Level(s): Clear
Current Conditions at
STERLING ROCK - (KSQI)
79°
Clear
as of 3:56 PM CDST
Rel. Humidity: 34%
Dew Point: 48°F
Visibility: 10 Miles
Pressure: 29.88 in.
Flight Rule: VFR
Wind Data
10 MPH
300° Northwest
Cloud Level(s): Clear
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 48. Northwest wind around 5 mph, with gusts as high as 15 mph.

Partly Sunny on Thursday Thursday... Partly sunny through mid morning, then becoming sunny, with a high near 70. Light northwest wind becoming west northwest 5 to 10 mph in the morning.

Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 48. Northwest wind around 5 mph becoming calm.

30% chance of thunderstorms Friday Friday... A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm. Mostly sunny, with a high near 74. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 58. South southeast wind around 10 mph, with gusts as high as 20 mph.

Sunny on Saturday Saturday... Sunny, with a high near 81.

Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 56.

Partly Sunny on Sunday Sunday... Partly sunny, with a high near 77.

Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 56.

Mostly Sunny on Columbus Day Columbus Day... Mostly sunny, with a high near 78.

20% chance of rain Monday Night Monday Night... A chance of showers. Mostly cloudy, with a low around 48.

Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 64.

Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 42.

Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 62.

Illinois' Warnings, Watches, and AdvisoriesIllinois' Watches, Warnings, and Advisories

Sun Almanac for Flagg, Illinois
Astronomical Sunrise 05:28 AM?Astronomical sunrise occurs when the Sun is 18° below the horizon and the sky begins to brighten from a completly darkened state.
Nautical Sunrise 06:00 AM?Nautical sunrise (or nautical dawn) is the precise moment when the sun's center is 12° below the horizon in the morning. It marks the beginning of nautical twilight, allowing pilots/mariners to see the horizon.
Civil Sunrise 06:33 AM?Civil sunrise is the moment in the morning when the sun's center is 6° below the horizon. It marks the start of morning civil twilight, providing enough natural light for most, outdoor activities without artificial lighting. It typically occurs roughly 20-30 minutes before actual sunrise.
Sunrise 07:00 AM?Sunrise (or sunup) is the moment when the upper rim of the Sun appears on the horizon in the morning. It marks the end of the twilight phase, often accompanied by distinct atmospheric colors.

Daylight: 11 Hours 28 Minutes?Daylight hours are the period of time between local sunrise and sunset, representing the daily portion of sunlight. These hours change in length based on season, Earth's tilt, and latitude.

Sunset 6:28 PM?The sunset is defined in astronomy as the moment the upper limb of the Sun disappears below the horizon. It marks the end of daylight and is often accompanied by distinct atmospheric colors. It also signals the beginning of twilight.
Civil Sunset 6:56 PM?Civil sunset (or evening civil twilight) occurs when the center of the sun is 6° below the horizon, marking the end of the brightest twilight phase. It typically occurs roughly 20-30 minutes after sunset, providing enough light for most outdoor activities to continue without artificial light.
Nautical Sunset 7:28 PM?Nautical sunset occurs when the sun's center is 12° below the horizon, marking the end of nautical twilight. This phase, following civil twilight, allows the horizon to remain visible, enabling mariners to take accurate star sights for navigation. The sky is dark, but some ambient light remains
Astronomical Sunset 8:01 PM?Astronomical sunrise occurs when the Sun drops to 18° below the horizon. This causes the sky to enter a completly darkened state.

Civil Rise to Set: 12 Hours 23 Minutes
Nautical Rise to Set: 13 Hours 28 Minutes
Astro Rise to Set: 14 Hours 33 Minutes

Click for yearly Sun Almanac for Flagg
Moon Almanac for Flagg, Illinois
Moon Phase: Waning Crescent
Moon Illumination: 8%
Moon Age: 26.7 Days
Moon is currently above the horizon
Distance from Moon to Earth: 233,567 miles
Upcoming Lunar Events for
Flagg:
Next EventEvent TimeIllum

Moonset:05:01 pm Wed8.7%
Moonrise:04:48 am Thu5.9%
High Moon:11:12 am Thu4.6%
Moonset:05:23 pm Thu3.5%
New Moon: Thu Sep 10
First Quarter: Fri Sep 18
Full Moon: Sat Sep 26
Last Quarter: Sat Oct 3
New Moon: Sat Oct 10
Click for Monthly Moon Almanac