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Madison, Illinois

City in Madison County, Illinois

Air quality

The air at Madison

Index 23, good, led by ozone. Read at 10 PM from its reporting area, St. Louis (Metro-east) (IL), 12 miles off.

23Good
  • Fine particles (PM2.5)16Good1.8 mi
  • Ozone23Good16 ppb3.1 mi
  • Coarse particles (PM10)6Good1.8 mi
  • Nitrogen dioxide2Good2.6 ppb3.1 mi
  • Sulfur dioxide0Good0.9 ppb3.1 mi
  • Carbon monoxide-0.1 ppm3.1 mi

The days ahead

Highest moderate, today, led by fine particles. Yesterday measured 39, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Madison

0.70 in in the last 24 hours, 1.65 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.70in
Last 3 days
1.65in

Visibility

How far you can see at Madison, the next 45 hours

Visibility stays 4 miles or more through Sat 7 PM, lowest 5 miles Fri 6 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Madison, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now4 instruments

measured daily2 instruments

Madison 0.6 NNEIL-MD-26

In a volunteer observer's own ground/0.3 mi away/423 ft/13 ft above here

precip, snowfall, snow depth

Rank-

AltonALNI2

At a cooperative observer's station/13.9 mi away/394 ft/16 ft below here

snowfall, snow depth, precip, high, low

Rank981of 1,393

Station report

The weather at Cahokia/St Louis, drawn

The nearest airport reporting now, 7.8 mi from Madison, Illinois. From its report of Oct 15, 2026, 10:36 PM local time: 3 of its 6 sheets.

The sky

Broken at 2,600 ft, broken at 3,200 ft; the ceiling is 2,600 ft; visibility 10 mi or more.

Section of the sky over Cahokia/St Louis, height above the station to scale: broken cloud with its base at 2,600 feet, broken cloud with its base at 3,200 feet, the ceiling at 2,600 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 STATION01,0002,0003,0004,0005,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETBKN 3,200 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 2,600 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 2,600 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

70.0 F with a dew point of 63.0 F, 78 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 2,600 ft.

Chart of the air at Cahokia/St Louis: temperature 70.0 degrees Fahrenheit and dew point 63.0, 78 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 2,600 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 STATION01,0002,0003,0004,00050 F60 F70 F80 FSATURATES 1,600 FT ABOVE THE STATION, AT 61.3 FLOWEST CLOUD REPORTED, BKN 2,600 FTTEMPERATURE 70.0 FDEW POINT 63.0 FSPREAD 7.0 FRELATIVE HUMIDITY 78 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 18 mph, gusting 35 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 37 mph.

Plan of the wind at Cahokia/St Louis, north up: blowing from 310 degrees, the northwest, at 18 miles an hour, gusting 35; 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, 18 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE32GUST, 35 MPH8GALE399STRONG 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

0in

Snow on the ground

Measured at Mississippi River AT Mel Price LD (ALNI2), 13.9 miles from here, read 15 Oct, 05:00. measured daily

Elsewhere in Illinois

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

Near Madison

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

Near Madison

River and lake gauges