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Columbia, Illinois

City in Monroe County, Illinois

Air quality

The air at Columbia

Index 19, good, led by ozone. Read at 3 AM from its reporting area, St. Louis (Metro-east) (IL), 15 miles off.

19Good
  • Fine particles (PM2.5)9Good11.5 mi
  • Ozone19Good19 ppb11.5 mi
  • Coarse particles (PM10)4Good18 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 39, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Columbia

0.27 in in the last 24 hours, 0.84 in over the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.27in
Last 3 days
0.84in

Visibility

How far you can see at Columbia, the next 41 hours

Visibility stays 7 miles or more through Sat 7 PM, lowest 7 miles Fri 9 PM.

FriSat

On the radar over Columbia, IllinoisReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Columbia, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.5 miles away.

measured now4 instruments

measured daily2 instruments

Columbia 0.8 EIL-MO-1

In a volunteer observer's own ground/0.5 mi away/450 ft/44 ft below here

precip, snowfall, snow depth

Rank-

Milstadt 2SWMSTI2

At a cooperative observer's station/3.9 mi away/656 ft/162 ft above here

snowfall, snow depth, precip, high, low

Rank33of 1,393

Station report

The weather at Cahokia/St Louis, drawn

The nearest airport reporting now, 8.7 mi from Columbia, Illinois. From its report of Oct 16, 2026, 3:00 AM local time: 3 of its 6 sheets.

The sky

Scattered at 2,300 ft, scattered at 3,300 ft, overcast at 9,000 ft; the ceiling is 9,000 ft; visibility 10 mi or more.

Section of the sky over Cahokia/St Louis, height above the station to scale: scattered cloud with its base at 2,300 feet, scattered cloud with its base at 3,300 feet, overcast cloud with its base at 9,000 feet, the ceiling at 9,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CPSFIG. A THE SKY OVER CAHOKIA/ST LOUISSECTION, HEIGHT ABOVE THE STATION TO SCALE, EACH LAYER AT THE HEIGHT OF ITS BASE AS REPORTED; COVER IN EIGHTHS OF THE SKY; TOPS NOT MEASUREDFT ABOVE THE STATION02,5005,0007,50010,00012,50015,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 9,000 FTOVERCAST, 8 EIGHTHS OF THE SKYSCT 3,300 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYSCT 2,300 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 9,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLECahokia/St Louis, the skySTATION REPORT · ASOS CPSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-CPS-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014

The air

57.0 F with a dew point of 50.0 F, 77 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,600 ft up; the lowest cloud reported is at 2,300 ft.

Chart of the air at Cahokia/St Louis: temperature 57.0 degrees Fahrenheit and dew point 50.0, 77 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,600 feet above the station, against the lowest cloud reported at 2,300 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CPSFIG. B THE AIR AT CAHOKIA/ST LOUISTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 1,600 FT ABOVE THE STATION, AT 48.4 FLOWEST CLOUD REPORTED, SCT 2,300 FTTEMPERATURE 57.0 FDEW POINT 50.0 FSPREAD 7.0 FRELATIVE HUMIDITY 77 PER CENTTHE AIR COOLS ABOUT 5.4 F EACH 1,000 FT IT RISES, AND ITS DEW POINT ABOUT 1 FSOLID: THE LIFTED AIR'S TEMPERATURE; DASHED: ITS DEW POINTTITLECahokia/St Louis, the airSTATION REPORT · ASOS CPSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-CPS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 16 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 35 mph.

Plan of the wind at Cahokia/St Louis, north up: blowing from 310 degrees, the northwest, at 16 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CPSFIG. C THE WIND AT CAHOKIA/ST LOUISPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 16 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECahokia/St Louis, the windSTATION REPORT · ASOS CPSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-CPS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Cahokia/St Louis, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Illinois

23 places, each with its own forecast and its own instruments.

Near Columbia

The nearest places, each with its own forecast and the instruments nearest it.

Near Columbia

River and lake gauges