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Ballwin, Missouri

City in St. Louis County, Missouri

Air quality

The air at Ballwin

Index 27, good, led by ozone. Read at 10 PM from its reporting area, Saint Louis (MO), 9 miles off.

27Good
  • Fine particles (PM2.5)12Good12.8 mi
  • Ozone27Good8 ppb9.3 mi
  • Coarse particles (PM10)8Good12.8 mi
  • Nitrogen dioxide2Good2.2 ppb12.5 mi
  • Sulfur dioxide0Good0.4 ppb12.5 mi
  • Carbon monoxide-0.1 ppm14.8 mi

The days ahead

Good each day through Today, led by ozone. Yesterday measured 44, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Ballwin

0.64 in in the last 24 hours, 1.30 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.64in
Last 3 days
1.30in

Visibility

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

Visibility stays 10 miles or more through Sat 7 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Ballwin, 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

St. CharlesSCLM7

At a river or reservoir gauge/14.4 mi away/443 ft/144 ft below here

temp, wind, gust, humidity, pressure

Rank651of 1,014

measured daily2 instruments

Ballwin 0.3 SMO-SL-112

In a volunteer observer's own ground/0.1 mi away/603 ft/16 ft above here

precip, snowfall, snow depth

Rank-

Missouri RiverSTCM7

At a cooperative observer's station/6.7 mi away/440 ft/147 ft below here

snowfall, snow depth, precip, high, low

Rank592of 1,014

Station report

The weather at St. Louis/Spirit, drawn

The nearest airport reporting now, 7.3 mi from Ballwin, Missouri. From its report of Oct 15, 2026, 10:20 PM local time: 3 of its 6 sheets.

The sky

Broken at 1,300 ft, overcast at 2,000 ft; the ceiling is 1,300 ft; visibility 6 mi.

Section of the sky over St. Louis/Spirit, height above the station to scale: broken cloud with its base at 1,300 feet, overcast cloud with its base at 2,000 feet, the ceiling at 1,300 feet, and visibility of 6 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SUSFIG. A THE SKY OVER ST. LOUIS/SPIRITSECTION, 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 1,300 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 1,300 FTVISIBILITY, MILES: 6 MI0510TITLESt. Louis/Spirit, the skySTATION REPORT · ASOS SUSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SUS-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

65.0 F with a dew point of 62.0 F, 90 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 700 ft up; the lowest cloud reported is at 1,300 ft.

Chart of the air at St. Louis/Spirit: temperature 65.0 degrees Fahrenheit and dew point 62.0, 90 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 700 feet above the station, against the lowest cloud reported at 1,300 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SUSFIG. B THE AIR AT ST. LOUIS/SPIRITTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 F80 FSATURATES 700 FT ABOVE THE STATION, AT 61.3 FLOWEST CLOUD REPORTED, BKN 1,300 FTTEMPERATURE 65.0 FDEW POINT 62.0 FSPREAD 3.0 FRELATIVE HUMIDITY 90 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/Spirit, the airSTATION REPORT · ASOS SUSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SUS-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 17 mph, gusting 26 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 32 mph.

Plan of the wind at St. Louis/Spirit, north up: blowing from 310 degrees, the northwest, at 17 miles an hour, gusting 26; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SUSFIG. C THE WIND AT ST. LOUIS/SPIRITPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 17 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 26 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESt. Louis/Spirit, the windSTATION REPORT · ASOS SUSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SUS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of St. Louis/Spirit, 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 Ballwin

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

Near Ballwin

River and lake gauges