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Pontoon Beach, Illinois

Village in Madison County, Illinois

Air quality

The air at Pontoon Beach

Index 22, good, led by ozone. Read at 9 PM from its reporting area, St. Louis (Metro-east) (IL), 12 miles off.

22Good
  • Fine particles (PM2.5)21Good4.2 mi
  • Ozone22Good29 ppb8.6 mi
  • Coarse particles (PM10)7Good4.2 mi
  • Nitrogen dioxide3Good3.9 ppb8.6 mi
  • Sulfur dioxide0Good0.5 ppb8.6 mi
  • Carbon monoxide-0.1 ppm8.6 mi

The days ahead

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

Smoke, the next 41 hours

No smoke near the ground through Sat 1 PM.

FriSat

Precipitation

What has fallen at Pontoon Beach

0.88 in in the last 24 hours, 1.75 in over the last 3 days, to Thu 8 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.88in
Last 3 days
1.75in

Visibility

How far you can see at Pontoon Beach, the next 41 hours

Visibility stays 5 miles or more through Sat 1 PM, lowest 6 miles Fri 12 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Pontoon Beach, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.4 miles away.

measured now4 instruments

measured daily2 instruments

Granite City 2.3 NEIL-MD-12

In a volunteer observer's own ground/1.4 mi away/417 ft/2 ft above here

precip, snowfall, snow depth

Rank-

AltonALNI2

At a cooperative observer's station/12.2 mi away/394 ft/21 ft below here

snowfall, snow depth, precip, high, low

Rank981of 1,393

Station report

The weather at Alton/St Louis R, drawn

The nearest airport reporting now, 11.2 mi from Pontoon Beach, Illinois. From its report of Oct 15, 2026, 8:50 PM local time: 3 of its 6 sheets.

The sky

Scattered at 3,500 ft, broken at 6,000 ft, overcast at 8,000 ft; the ceiling is 6,000 ft; visibility 10 mi or more.

Section of the sky over Alton/St Louis R, height above the station to scale: scattered cloud with its base at 3,500 feet, broken cloud with its base at 6,000 feet, overcast cloud with its base at 8,000 feet, the ceiling at 6,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. A THE SKY OVER ALTON/ST LOUIS RSECTION, 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 STATION02,5005,0007,50010,00012,500ETAGESLOWMIDDLETHE STATIONOVC 8,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 6,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 3,500 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 6,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEAlton/St Louis R, the skySTATION REPORT · ASOS ALNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-ALN-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

75.2 F with a dew point of 66.2 F, 74 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,100 ft up; the lowest cloud reported is at 3,500 ft.

Chart of the air at Alton/St Louis R: temperature 75.2 degrees Fahrenheit and dew point 66.2, 74 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,100 feet above the station, against the lowest cloud reported at 3,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. B THE AIR AT ALTON/ST LOUIS RTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00050 F60 F70 F80 F90 FSATURATES 2,100 FT ABOVE THE STATION, AT 64.1 FLOWEST CLOUD REPORTED, SCT 3,500 FTTEMPERATURE 75.2 FDEW POINT 66.2 FSPREAD 9.0 FRELATIVE HUMIDITY 74 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 POINTTITLEAlton/St Louis R, the airSTATION REPORT · ASOS ALNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-ALN-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west southwest (250 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at Alton/St Louis R, north up: blowing from 250 degrees, the west southwest, at 12 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. C THE WIND AT ALTON/ST LOUIS RPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 250°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAlton/St Louis R, the windSTATION REPORT · ASOS ALNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-ALN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Alton/St Louis R, 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), 12.2 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 Pontoon Beach

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

Near Pontoon Beach

River and lake gauges