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Marthasville, Missouri

City in Warren County, Missouri

Air quality

The air at Marthasville

Index 19, good, led by ozone. Read at 5 AM from its reporting area, Saint Louis (MO), 18 miles off.

19Good
  • Fine particles (PM2.5)17Good-
  • Ozone19Good16 ppb21 mi
  • Coarse particles (PM10)9Good-

The days ahead

Yesterday measured 40, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Marthasville

0.51 in in the last 24 hours, 1.10 in over the last 3 days, to Fri 4 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.51in
Last 3 days
1.10in

Visibility

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

Visibility stays 10 miles or more through Sun 1 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Marthasville, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.9 miles away.

measured now4 instruments

measured daily2 instruments

Marthasville 4.7 NMO-WR-7

In a volunteer observer's own ground/4.4 mi away/839 ft/299 ft above here

precip, snowfall, snow depth

Rank-

WashingtonWHGM7

At a cooperative observer's station/7.5 mi away/492 ft/48 ft below here

snowfall, snow depth, precip, high, low

Rank600of 1,014

Station report

The weather at Washington, drawn

The nearest airport reporting now, 4.4 mi from Marthasville, Missouri. From its report of Oct 16, 2026, 4:55 AM local time: 3 of its 6 sheets.

The sky

Scattered at 3,400 ft, scattered at 7,500 ft, broken at 9,000 ft; the ceiling is 9,000 ft; visibility 10 mi or more.

Section of the sky over Washington, height above the station to scale: scattered cloud with its base at 3,400 feet, scattered cloud with its base at 7,500 feet, broken cloud with its base at 9,000 feet, the ceiling at 9,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT FYGFIG. A THE SKY OVER WASHINGTONSECTION, 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 STATION02,5005,0007,50010,00012,50015,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTBKN 9,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 7,500 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYSCT 3,400 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 9,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEWashington, the skySTATION REPORT · ASOS FYGTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-FYG-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

55.4 F with a dew point of 50.0 F, 82 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,200 ft up; the lowest cloud reported is at 3,400 ft.

Chart of the air at Washington: temperature 55.4 degrees Fahrenheit and dew point 50.0, 82 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,200 feet above the station, against the lowest cloud reported at 3,400 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT FYGFIG. B THE AIR AT WASHINGTONTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00040 F50 F60 F70 FSATURATES 1,200 FT ABOVE THE STATION, AT 48.8 FLOWEST CLOUD REPORTED, SCT 3,400 FTTEMPERATURE 55.4 FDEW POINT 50.0 FSPREAD 5.4 FRELATIVE HUMIDITY 82 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 POINTTITLEWashington, the airSTATION REPORT · ASOS FYGTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-FYG-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (300 degrees) at 17 mph, gusting 26 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 26 mph.

Plan of the wind at Washington, north up: blowing from 300 degrees, the west 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 FYGFIG. C THE WIND AT WASHINGTONPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 17 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 26 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWashington, the windSTATION REPORT · ASOS FYGTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-FYG-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Washington, 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 Marthasville

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

Near Marthasville

River and lake gauges