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Marion, IL 62959 Weather
Current conditions
Observed at Marion - Williamson County Regional Airport · 56 min ago
Forecast
10-day-
Overnight
Clear. Low around 45, with temperatures rising to around 47 overnight. Wind around 0 mph.
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Thursday
Sunny. High near 77, with temperatures falling to around 75 in the afternoon. North northeast wind 0 to 6 mph.
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Thursday Night
Clear, with a low around 45. East northeast wind 0 to 3 mph.
National Weather Service forecast updated 2 hrs ago.
Hourly
Hourly forecast- Now49°
- 4 AM48°
- 5 AM47°
- 6 AM46°
- 7 AM45°
- 8 AM47°
- 9 AM54°
- 10 AM64°
- 11 AM69°
- 12 PM72°
- 1 PM75°
- 2 PM76°
- 3 PM76°
- 4 PM77°
- 5 PM75°
- 6 PM72°
- 7 PM67°
- 8 PM60°
- 9 PM58°
- 10 PM55°
- 11 PM54°
- Fri12 AM52°
- 1 AM51°
- 2 AM49°
10-day forecast
Details- TonightOct 21Clear45°
- TodayOct 22Sunny45°77°
- FriOct 23Sunny42°75°
- SatOct 24Sunny46°76°
- SunOct 25Mostly Sunny48°78°
- MonOct 26Partly Sunny47°76°
- TueOct 27Partly Sunny46°73°
- WedOct 28Mostly Sunny72°
- ThuOct 29Mostly sunny42°68°
- FriOct 30Partly cloudy54°73°
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 · 1 hr 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 34 km
- West Frankfort 19 km
- Murphysboro 36 km
- Benton 30 km
- Du Quoin 42 km
- Carterville 14 km
- Pinckneyville 56 km
- Anna 41 km
- Eldorado 44 km
- Johnston City 11 km
Forecasters' discussion
From the National Weather Service office in PAH, issued 15 hrs ago
Key Messages
- Areas of dense fog will continue late overnight into the morning hours near bodies of water.
- Generally clear and temperate conditions will remain through the weekend.
- A small chance of a shower exists early next week, though confidence is low.
Discussion
Issued at 1219 PM CDT Wed Oct 21 2026
An UL omega block has been established, with our CWA on the eastern edge of the 250 mb ridge as of 16z. As such, high surface pressure will be dominant until Monday at the earliest, leaving generally cloudless skies and seasonable, if not slightly above average, temperatures. Tuesday, long-range guidance suggests weak FROPA associated with the easterly progression of the UL trough, but vorticity and frontogenesis values are low, and 250 mb flow is only weakly perturbed. GFS and ECMWF 500 mb relative humidity prog <40%, so chances of widespread precipitation are minimal. A brief shower or two cannot be ruled out though, especially Tuesday morning in western parts of our coverage area.
Given weak surface flow, patchy areas of dense radiation fog are possible near bodies of water and in surrounding low-lying areas overnight through the morning. Widely scattered clouds tomorrow morning will not hinder the suns ability to quickly erode this fog, so expect the fog threat to be eliminated by 15z tomorrow.
Aviation
Issued at 1209 PM CDT Wed Oct 21 2026
High pressure will continue to bring calm or very light NE winds through the forecast period. Low-lying river valley fog development is expected again during the 11-13z Thursday period. Included this in the CGI and OWB TAFs where impacts are most likely. Otherwise, VFR conditions are expected.
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.