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Weather Conditions for Grand Pass, Illinois : Greene County
Issued: 6:16 pm CDT Sep 8, 2026 Latitude: 39.4578257 Longitude: -90.5962362 View on Google Maps

MouseOver for Detail Forecast
Tonight Wednesday Thursday Friday Saturday Sunday Monday Tuesday
Mostly Clear on Tonight 30% chance of thunderstorms on Wednesday 60% chance of thunderstorms on Thursday Sunny on Friday 40% chance of thunderstorms on Saturday 30% chance of thunderstorms on Sunday 30% chance of thunderstorms on Monday 30% chance of thunderstorms on Tuesday
Low: 73°F High: 93°F High: 83°F High: 86°F High: 89°F High: 86°F High: 88°F High: 84°F
Low: 67°F Low: 59°F Low: 64°F Low: 65°F Low: 64°F Low: 65°F  
Mostly Clear Thunderstorms Thunderstorms Sunny Thunderstorms Thunderstorms Thunderstorms Thunderstorms
Current Conditions at
PITTSFIELD - (KPPQ)
79°
Clear
as of 10:15 PM CDST
Rel. Humidity: 61%
Dew Point: 64°F
Visibility: 10 Miles
Pressure: 30.07 in.
Flight Rule: VFR
Wind Data
3 MPH
170° South
Cloud Level(s): Clear
Current Conditions at
JACKSONVILLE MUNICIPAL - (KIJX)
82°
Clear
as of 10:15 PM CDST
Rel. Humidity: 51%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
6 MPH
170° South
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
75°
Clear
as of 9:54 PM CDST
Rel. Humidity: 73%
Dew Point: 66°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
QUINCY - (KUIN)
82°
Clear
as of 9:54 PM CDST
Rel. Humidity: 54%
Dew Point: 64°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
9 MPH
160° South
Cloud Level(s): Clear
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 73. South wind around 6 mph.

30% chance of thunderstorms Wednesday Wednesday... A 30 percent chance of showers and thunderstorms, mainly after 11am. Mostly sunny, with a high near 93. South wind 5 to 9 mph becoming west in the afternoon.

70% chance of thunderstorms Wednesday Night Wednesday Night... A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Increasing clouds, with a low around 67. North wind around 6 mph becoming calm after midnight. Chance of precipitation is 70%.

60% chance of thunderstorms Thursday Thursday... Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 83. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 60%.

Mostly Clear on Thursday Night Thursday Night... Mostly clear, with a low around 59. Calm wind.

Sunny on Friday Friday... Sunny, with a high near 86.

Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 64.

40% chance of thunderstorms Saturday Saturday... A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.

30% chance of thunderstorms Saturday Night Saturday Night... A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.

30% chance of thunderstorms Sunday Sunday... A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.

30% chance of thunderstorms Sunday Night Sunday Night... A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.

30% chance of thunderstorms Monday Monday... A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.

40% chance of thunderstorms Monday Night Monday Night... A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.

30% chance of thunderstorms Tuesday Tuesday... A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.

Current Radar Image


Sun Almanac for Grand Pass, Illinois
Astronomical Sunrise 05:05 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 05:38 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 06:38 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 44 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 7:22 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 7:50 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 8:22 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 8:55 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 40 Minutes
Nautical Rise to Set: 14 Hours 44 Minutes
Astro Rise to Set: 15 Hours 50 Minutes

Click for yearly Sun Almanac for Grand Pass
Moon Almanac for Grand Pass, Illinois
Moon Phase: Waning Crescent
Moon Illumination: 5%
Moon Age: 27.4 Days
Moon is currently below the horizon
Distance from Moon to Earth: 230,351 miles
Upcoming Lunar Events for
Grand Pass:
Next EventEvent TimeIllum

Moonrise:04:49 am Wed4.0%
High Moon:11:50 am Wed2.8%
Moonset:06:37 pm Wed1.8%
New Moon: Wed Aug 12
First Quarter: Wed Aug 19
Full Moon: Fri Aug 28
Last Quarter: Fri Sep 4
New Moon: Thu Sep 10
Click for Monthly Moon Almanac