Marion, IL Weather

Williamson County2:49 PM CDT37.73°N, 88.93°WElevation 423 ft

Current conditions

Clear
72°
Clear
Feels like 70°
High 73°·Low 43°
WindCalm
Humidity38%
Dew point45°
Pressure30.34 inHg
Visibility10 mi
Cloud cover2%
UV index4 Moderate
Sunrise7:09 AM
Sunset6:13 PM

Observed at Southern Illinois Airport · 1 hr ago

Forecast

10-day

  • Today

    Sunny. High near 73, with temperatures falling to around 71 in the afternoon. East northeast wind around 3 mph.

  • Tonight

    Mostly clear, with a low around 43. Northeast wind around 1 mph.

  • Wednesday

    Sunny. High near 75, with temperatures falling to around 73 in the afternoon. North northeast wind 0 to 3 mph.

National Weather Service forecast updated 3 hrs ago.

Hourly

Hourly forecast
  1. Now Sunny 72°
  2. 3 PM Sunny 73°
  3. 4 PM Sunny 73°
  4. 5 PM Sunny 71°
  5. 6 PM Clear 68°
  6. 7 PM Clear 63°
  7. 8 PM Clear 56°
  8. 9 PM Clear 54°
  9. 10 PM Clear 52°
  10. 11 PM Mostly Clear 50°
  11. Wed12 AM Mostly Clear 48°
  12. 1 AM Mostly Clear 47°
  13. 2 AM Mostly Clear 46°
  14. 3 AM Mostly Clear 46°
  15. 4 AM Mostly Clear 45°
  16. 5 AM Mostly Clear 44°
  17. 6 AM Sunny 44°
  18. 7 AM Sunny 43°
  19. 8 AM Sunny 45°
  20. 9 AM Sunny 51°
  21. 10 AM Sunny 60°
  22. 11 AM Sunny 65°
  23. 12 PM Sunny 70°
  24. 1 PM Sunny 72°

10-day forecast

Details
  1. TodayOct 20 Sunny Sunny43°73°
  2. WedOct 21 Sunny Sunny45°75°
  3. ThuOct 22 Sunny Sunny45°77°
  4. FriOct 23 Sunny Sunny44°75°
  5. SatOct 24 Mostly Sunny Mostly Sunny47°76°
  6. SunOct 25 Mostly Sunny Mostly Sunny48°77°
  7. MonOct 26 Mostly Sunny Mostly Sunny48°75°
  8. TueOct 27 Sunny Sunny51°73°
  9. WedOct 28 Cloudy Cloudy54°67°
  10. ThuOct 29 Partly cloudy Partly cloudy50°66°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
Open the National Weather Service radar (the map here needs JavaScript).

Weather news near Marion

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Air quality

36
Good
Ozone

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

Sunrise 7:09 AM
Sunset 6:13 PM
Daylight 11 h 3 min (−2 min 17 s tomorrow)
Waxing Gibbous · 71% lit
Moonrise 3:20 PM Moonset 1:17 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low69° / 43°
Record high91° (1963)
Record low22° (2022)
Wettest0.95 in (1926)
Yesterday72° / 37°
Month to date1.00 in (normal 2.10 in)

Carbondale Area, records since 1898. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in PAH, issued 3 hrs ago

Key Messages

- Areas of fog, some possibly dense, will develop near bodies of water early Wednesday morning.

- Near to slightly above normal temperatures are forecast for the next seven days.

- No rainfall is forecast for the next seven days.

Discussion

Issued at 1119 AM CDT Tue Oct 20 2026

Sprawling high pressure centered over the eastern and northeast CONUS combined with stable H5 ridging over the southern and central CONUS will bring quiet and stable weather to the region for the next week. Temperatures will be nearly the same each day, with highs in the lower to middle 70s and lows in the middle to upper 40s. The only mentionable weather concern will be for shallow (and possibly briefly dense) fog development early Wednesday morning near bodies of water (lakes, rivers, ponds, etc.). Have added fog to the forecast for these areas.

Aviation

Issued at 1119 AM CDT Tue Oct 20 2026

Shallow ground fog will develop early Wednesday morning along larger bodies of water. Have added fog to CGI between the 11-13z period to account for this. Otherwise, VFR conditions are expected with calm or very light NE winds and clear to mostly clear skies.

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 4Conservative index and reflects what the press published. Terms of use.