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St. Marys, Iowa

City in Warren County, Iowa

Air quality

The air at St. Marys

Index 17, good, led by ozone. Read at 11 PM from its reporting area, Des Moines (IA), 16 miles off.

17Good
  • Fine particles (PM2.5)8Good-
  • Ozone17Good21 ppb20.9 mi

The days ahead

Highest moderate, today, led by fine particles. Yesterday measured 20, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at St. Marys

0.61 in in the last 24 hours, and none in the 2 days before, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.61in
Last 3 days
0.61in

Visibility

How far you can see at St. Marys, the next 45 hours

Visibility stays 7 miles or more through Sat 7 PM, lowest 8 miles Sat 3 AM.

FriSat

On the radar over St. Marys, IowaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest St. Marys, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.7 miles away.

measured now5 instruments

Des MoinesDSM

At an airfield/16.3 mi away/965 ft/53 ft below here

temp, wind, gust, visibility, precip, pressure

Rank171of 1,060

measured daily2 instruments

Martensdale 1.7 SEIA-WR-13

In a volunteer observer's own ground/3.7 mi away/902 ft/116 ft below here

precip, snowfall, snow depth

Rank-

Indianola 4 WIDAI4

At a cooperative observer's station/10.6 mi away/961 ft/57 ft below here

snowfall, snow depth, precip, high, low

Rank90of 1,060

Station report

The weather at Des Moines, drawn

The nearest airport reporting now, 16.3 mi from St. Marys, Iowa. From its report of Oct 15, 2026, 10:54 PM local time: 3 of its 6 sheets.

The sky

Broken at 5,000 ft; the ceiling is 5,000 ft; visibility 10 mi or more.

Section of the sky over Des Moines, height above the station to scale: broken cloud with its base at 5,000 feet, the ceiling at 5,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DSMFIG. A THE SKY OVER DES MOINESSECTION, 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 STATION01,0002,0003,0004,0005,0006,0007,0008,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETBKN 5,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 5,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEDes Moines, the skySTATION REPORT · ASOS DSMTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DSM-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

50.0 F with a dew point of 41.0 F, 71 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 5,000 ft.

Chart of the air at Des Moines: temperature 50.0 degrees Fahrenheit and dew point 41.0, 71 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 5,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DSMFIG. B THE AIR AT DES MOINESTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00030 F40 F50 F60 FSATURATES 2,100 FT ABOVE THE STATION, AT 39.0 FLOWEST CLOUD REPORTED, BKN 5,000 FTTEMPERATURE 50.0 FDEW POINT 41.0 FSPREAD 9.0 FRELATIVE HUMIDITY 71 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 POINTTITLEDes Moines, the airSTATION REPORT · ASOS DSMTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DSM-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (320 degrees) at 21 mph, gusting 30 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 46 mph.

Plan of the wind at Des Moines, north up: blowing from 320 degrees, the northwest, at 21 miles an hour, gusting 30; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DSMFIG. C THE WIND AT DES MOINESPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 320°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 21 MPH6STRONG BREEZE25GUST, 30 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEDes Moines, the windSTATION REPORT · ASOS DSMTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DSM-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Des Moines, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Indianola 4 W (IDAI4), 10.6 miles from here, read 15 Oct, 07:00. measured daily

Elsewhere in Iowa

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

Near St. Marys

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

Near St. Marys

River and lake gauges