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Affton, Missouri

Community in St. Louis County, Missouri

Air quality

The air at Affton

Index 19, good, led by ozone. Read at 4 AM from its reporting area, St. Louis (Metro-east) (IL), 19 miles off.

19Good
  • Fine particles (PM2.5)9Good6 mi
  • Ozone19Good19 ppb8.2 mi
  • Coarse particles (PM10)4Good8.2 mi
  • Nitrogen dioxide2Good2.6 ppb6 mi
  • Sulfur dioxide0Good0.4 ppb9.9 mi
  • Carbon monoxide-0.1 ppm6 mi

The days ahead

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

Smoke, the next 46 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Affton

0.52 in in the last 24 hours, 1.70 in over the last 3 days, to Fri 3 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.52in
Last 3 days
1.70in

Visibility

How far you can see at Affton, the next 46 hours

Visibility stays 8 miles or more through Sun 1 AM, lowest 9 miles Fri 6 PM.

FriSat

On the radar over Affton, MissouriReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Affton, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now4 instruments

St. LouisSTL

At an airfield/14.3 mi away/561 ft/27 ft above here

temp, wind, gust, visibility, precip, pressure

Rank810of 1,014

measured daily2 instruments

Affton 0.2 SSWMO-SL-94

In a volunteer observer's own ground/0.4 mi away/577 ft/43 ft above here

precip, snowfall, snow depth

Rank-

Kirkwood 1NNWKWDM7

At a cooperative observer's station/6.0 mi away/661 ft/127 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at St. Louis, drawn

The nearest airport reporting now, 14.3 mi from Affton, Missouri. From its report of Oct 16, 2026, 4:00 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 2,000 ft, broken at 2,700 ft, broken at 10,000 ft, overcast at 13,000 ft; the ceiling is 2,700 ft; visibility 10 mi or more.

Section of the sky over St. Louis, height above the station to scale: a few clouds cloud with its base at 2,000 feet, broken cloud with its base at 2,700 feet, broken cloud with its base at 10,000 feet, overcast cloud with its base at 13,000 feet, the ceiling at 2,700 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STLFIG. A THE SKY OVER 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 STATION02,5005,0007,50010,00012,50015,00017,50020,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 13,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 10,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 2,700 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 2,000 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 2,700 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLESt. Louis, the skySTATION REPORT · ASOS STLTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-STL-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

55.0 F with a dew point of 48.0 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 2,000 ft.

Chart of the air at St. Louis: temperature 55.0 degrees Fahrenheit and dew point 48.0, 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 2,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STLFIG. B THE AIR AT 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 46.4 FLOWEST CLOUD REPORTED, FEW 2,000 FTTEMPERATURE 55.0 FDEW POINT 48.0 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 POINTTITLESt. Louis, the airSTATION REPORT · ASOS STLTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-STL-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (300 degrees) at 13 mph, gusting 25 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 35 mph.

Plan of the wind at St. Louis, north up: blowing from 300 degrees, the west northwest, at 13 miles an hour, gusting 25; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STLFIG. C THE WIND AT ST. LOUISPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 13 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 25 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESt. Louis, the windSTATION REPORT · ASOS STLTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-STL-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Missouri

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

Near Affton

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

Near Affton

River and lake gauges