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Weldon Spring, Missouri

City in St. Charles County, Missouri

Air quality

The air at Weldon Spring

Index 19, good, led by ozone. Read at 11 PM from its reporting area, Saint Louis (MO), 7 miles off.

19Good
  • Fine particles (PM2.5)14Good20.8 mi
  • Ozone19Good8 ppb9.4 mi
  • Coarse particles (PM10)7Good23.2 mi
  • Nitrogen dioxide2Good2.2 ppb11.1 mi
  • Sulfur dioxide0Good0.4 ppb11.1 mi
  • Carbon monoxide-0.1 ppm20.8 mi

The days ahead

Yesterday measured 44, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Weldon Spring

0.32 in in the last 24 hours, 1.00 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.32in
Last 3 days
1.00in

Visibility

How far you can see at Weldon Spring, the next 44 hours

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

FriSat

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

What is measuring near here

The 6 instruments nearest Weldon Spring, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.9 miles away.

measured now4 instruments

St. CharlesSCLM7

At a river or reservoir gauge/10.8 mi away/443 ft/152 ft below here

temp, wind, gust, humidity, pressure

Rank651of 1,014

measured daily2 instruments

St. Charles 10.5 WSWMO-SS-18

In a volunteer observer's own ground/2.0 mi away/617 ft/22 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at St. Louis/Spirit, drawn

The nearest airport reporting now, 4.2 mi from Weldon Spring, Missouri. From its report of Oct 15, 2026, 11:54 PM local time: 3 of its 6 sheets.

The sky

Broken at 1,300 ft, overcast at 2,400 ft; the ceiling is 1,300 ft; visibility 5 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 2,400 feet, the ceiling at 1,300 feet, and visibility of 5 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 STATION05001,0001,5002,0002,5003,0003,5004,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,400 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 1,300 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 1,300 FTVISIBILITY, MILES: 5 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

57.0 F with a dew point of 54.0 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 57.0 degrees Fahrenheit and dew point 54.0, 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 STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 700 FT ABOVE THE STATION, AT 53.3 FLOWEST CLOUD REPORTED, BKN 1,300 FTTEMPERATURE 57.0 FDEW POINT 54.0 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 west (280 degrees) at 14 mph, gusting 25 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 33 mph.

Plan of the wind at St. Louis/Spirit, north up: blowing from 280 degrees, the west, at 14 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 SUSFIG. C THE WIND AT ST. LOUIS/SPIRITPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 280°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 14 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 25 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

0in

Snow on the ground

Measured at Cottleville 1S (COTM7), 0.9 miles from here, read 14 Oct, 07:00. measured daily

Elsewhere in Missouri

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

Near Weldon Spring

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

Near Weldon Spring

River and lake gauges