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Weather Conditions for Grinnell, Illinois : Massac County
Issued: 9:11 am CDT Sep 13, 2026 Latitude: 37.2792195 Longitude: -88.8722846 View on Google Maps

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Today Tonight Monday Tuesday Wednesday Thursday Friday Saturday
Mostly Sunny on Today Cloudy on Tonight Mostly Sunny on Monday Sunny on Tuesday Sunny on Wednesday Sunny on Thursday Sunny on Friday 10% chance of rain on Saturday
High: 92°F Low: 68°F High: 89°F High: 96°F High: 95°F High: 95°F High: 91°F High: 87°F
Low: 71°F Low: 73°F Low: 72°F Low: 70°F Low: 66°F  
Mostly Sunny Cloudy Mostly Sunny Sunny Sunny Sunny Sunny Rain
Current Conditions at
METROPOLIS MUNI ARP - (KM30)
79°
Clear
as of 9:15 AM CDST
Rel. Humidity: 78%
Dew Point: 72°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
PADUCAH - (KPAH)
77°
Clear
as of 8:53 AM CDST
Rel. Humidity: 78%
Dew Point: 70°F
Visibility: 10 Miles
Pressure: 30.03 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
CAIRO - (KCIR)
81°
Clear
as of 9:15 AM CDST
Rel. Humidity: 83%
Dew Point: 75°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
MARION - (KMWA)
75°
Mostly Cloudy
as of 8:45 AM CDST
Rel. Humidity: 88%
Dew Point: 72°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 10000ft
Mostly Sunny on Today Today... Mostly sunny, with a high near 92. Light and variable wind.

Cloudy on Tonight Tonight... Partly cloudy, with a low around 68. Calm wind becoming northeast around 5 mph after midnight.

Mostly Sunny on Monday Monday... Mostly sunny, with a high near 89. East wind 5 to 7 mph.

Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 71. East wind 3 to 5 mph.

Sunny on Tuesday Tuesday... Sunny, with a high near 96. Calm wind becoming south southwest around 6 mph in the morning.

Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 73. Calm wind.

Sunny on Wednesday Wednesday... Sunny, with a high near 95. Calm wind becoming south southwest around 5 mph.

Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 72. Calm wind.

Sunny on Thursday Thursday... Sunny, with a high near 95. Calm wind becoming west southwest around 5 mph.

Mostly Clear on Thursday Night Thursday Night... Mostly clear, with a low around 70. Calm wind.

Sunny on Friday Friday... Sunny, with a high near 91. Calm wind becoming west around 5 mph.

Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 66. Calm wind.

10% chance of rain Saturday Saturday... A slight chance of showers. Mostly sunny, with a high near 87. Calm wind becoming west northwest 5 to 7 mph in the morning.

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

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Sun Almanac for Grinnell, Illinois
Astronomical Sunrise 05:08 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 05:39 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 06:10 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 06:36 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: 12 Hours 30 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 7:06 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 7:33 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 8:03 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 8:35 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: 13 Hours 23 Minutes
Nautical Rise to Set: 14 Hours 24 Minutes
Astro Rise to Set: 15 Hours 27 Minutes

Click for yearly Sun Almanac for Grinnell
Moon Almanac for Grinnell, Illinois
Moon Phase: Waxing Crescent
Moon Illumination: 7%
Moon Age: 2.53 Days
Moon is currently above the horizon
Distance from Moon to Earth: 243,112 miles
Upcoming Lunar Events for
Grinnell:
Next EventEvent TimeIllum

High Moon:02:47 pm Sun7.9%
Moonset:08:11 pm Sun9.2%
Moonrise:10:20 am Mon13.0%
High Moon:03:33 pm Mon14.5%
Moonset:08:40 pm Mon16.1%
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