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Marion, IL Weather
Current conditions
Observed at Marion - Williamson County Regional Airport · 1 hr ago
Forecast
10-day-
Wednesday
Sunny. High near 75, with temperatures falling to around 73 in the afternoon. North northeast wind 0 to 3 mph.
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Wednesday Night
Mostly clear. Low around 45, with temperatures rising to around 47 overnight. Wind around 0 mph.
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Thursday
Sunny, with a high near 76. North northeast wind 0 to 6 mph.
National Weather Service forecast updated 3 hrs ago.
Hourly
Hourly forecast- Now44°
- 9 AM51°
- 10 AM60°
- 11 AM65°
- 12 PM70°
- 1 PM72°
- 2 PM73°
- 3 PM74°
- 4 PM75°
- 5 PM73°
- 6 PM70°
- 7 PM65°
- 8 PM58°
- 9 PM56°
- 10 PM54°
- 11 PM52°
- Thu12 AM51°
- 1 AM50°
- 2 AM49°
- 3 AM48°
- 4 AM47°
- 5 AM47°
- 6 AM46°
- 7 AM45°
10-day forecast
Details- TonightOct 20Mostly Cloudy42°
- TodayOct 21Sunny45°75°
- ThuOct 22Sunny44°76°
- FriOct 23Sunny44°75°
- SatOct 24Sunny47°76°
- SunOct 25Mostly Sunny47°76°
- MonOct 26Partly Sunny48°75°
- TueOct 27Partly Sunny72°
- WedOct 28Cloudy47°60°
- ThuOct 29Sunny40°58°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Marion
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Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Farrar, MO reporting area · 53 min ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyCarbondale Area, records since 1898. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Carbondale 25 km
- Herrin 12 km
- Harrisburg 35 km
- West Frankfort 19 km
- Murphysboro 36 km
- Benton 30 km
- Du Quoin 41 km
- Carterville 13 km
- Pinckneyville 55 km
- Anna 41 km
- Eldorado 44 km
- Johnston City 10 km
Forecasters' discussion
From the National Weather Service office in PAH, issued 3 hrs ago
Key Messages
- Patchy fog, potentially dense will continue to be possible this morning near bodies of water.
- Temperatures will remain near to slightly above normal over the next seven days.
- A 15% chance of a sprinkle or isolated rain shower cannot be ruled out on Tuesday afternoon.
Discussion
Issued at 1216 AM CDT Wed Oct 21 2026
A ridge of high pressure will continue to provide abundant sunshine with ample dry weather conditions over the next seven days. The H5 ridge axis nudges more east on Saturday with heights peaking at 588 dm. This translates to daily light northeasterly winds shifting southerly on Saturday, only resulting in a subtle increase in WAA. Daily temperatures will remain near to slightly above normal in the mid to upper 70s, with lows ranging from the mid to upper 40s. Otherwise, patchy fog near bodies of water will remain possible this morning. The only other weather concern is a 15% chance of a sprinkle or isolated rain shower on Tuesday afternoon as a cold front washes out over the FA. While a 0% PoP is currently progged by the NBM, model ensembles support at least a slight mention.
Aviation
Issued at 526 AM CDT Wed Oct 21 2026
Light northeast winds around 4 kts and FEW-SCT high clouds across the west are forecast today over the region. Winds turn calm again tonight with mostly clear skies. There is a 10-30% chance of patchy shallow fog development again early Thursday morning, with the greatest probability at KCGI.
Pah Watches
IL...None. MO...None. IN...None. KY...None.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.