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Cahokia Heights, Illinois

City in St. Clair County, Illinois

Air quality

The air at Cahokia Heights

Index 18, good, led by ozone. Read at 3 PM from its reporting area, St. Louis (Metro-east) (IL), 10 miles off.

18Good
  • Fine particles (PM2.5)17Good2.9 mi
  • Ozone18Good14 ppb2.9 mi
  • Coarse particles (PM10)7Good6.2 mi
  • Nitrogen dioxide2Good2.8 ppb6.3 mi
  • Sulfur dioxide0Good0.4 ppb6.3 mi
  • Carbon monoxide-0.1 ppm6.3 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 Sun 7 AM.

FriSatSun

Precipitation

What has fallen at Cahokia Heights

0.01 in in the last 24 hours, 1.55 in over the last 3 days, to Fri 2 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.01in
Last 3 days
1.55in

Visibility

How far you can see at Cahokia Heights, the next 41 hours

Visibility stays 9 miles or more through Sun 7 AM, lowest 10 miles Sat 3 AM.

FriSatSun

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

What is measuring near here

The 6 instruments nearest Cahokia Heights, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.1 miles away.

measured now4 instruments

measured daily2 instruments

East St. Louis 1.3 NWIL-SC-36

In a volunteer observer's own ground/4.0 mi away/423 ft/13 ft above here

precip, snowfall, snow depth

Rank-

Milstadt 2SWMSTI2

At a cooperative observer's station/9.1 mi away/656 ft/246 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, 0.1 mi from Cahokia Heights, Illinois. From its report of Oct 16, 2026, 2:53 PM local time: 3 of its 6 sheets.

The sky

Scattered at 2,700 ft, broken at 3,700 ft, overcast at 6,000 ft; the ceiling is 3,700 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 2,700 feet, broken cloud with its base at 3,700 feet, overcast cloud with its base at 6,000 feet, the ceiling at 3,700 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 STATION02,5005,0007,50010,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 6,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 3,700 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 2,700 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 3,700 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

The air

53.0 F with a dew point of 47.0 F, 80 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,400 ft up; the lowest cloud reported is at 2,700 ft.

Chart of the air at Cahokia/St Louis: temperature 53.0 degrees Fahrenheit and dew point 47.0, 80 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,400 feet above the station, against the lowest cloud reported at 2,700 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 STATION01,0002,0003,0004,00030 F40 F50 F60 FSATURATES 1,400 FT ABOVE THE STATION, AT 45.6 FLOWEST CLOUD REPORTED, SCT 2,700 FTTEMPERATURE 53.0 FDEW POINT 47.0 FSPREAD 6.0 FRELATIVE HUMIDITY 80 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 (320 degrees) at 18 mph, gusting 30 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 39 mph.

Plan of the wind at Cahokia/St Louis, north up: blowing from 320 degrees, the northwest, at 18 miles an hour, gusting 30; 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 320°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 18 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 30 MPH7NEAR 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 Cahokia Heights

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

Near Cahokia Heights

River and lake gauges