Storm Station
St. Marys, Iowa
63°
Light rain· Feels like 63°·Light air 3 mph ESE
Showers and thunderstorms likely. Cloudy, with a low around 61. Southeast wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
-UV
-Air quality
97%Humidity
99%Cloud

What is measuring near here

The 6 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 now4 instruments

Des Moines (I-35)RDSI4

Beside a road/15.1 mi away/735 ft/283 ft below here

temp, pavement temp, wind, visibility, precip

Rank571of 652

Des MoinesDSM

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

temp, wind, gust, visibility, precip, pressure

Rank1of 652

Des Moines 17 E54902

At a climate reference station/29.1 mi away/903 ft/115 ft below here

temp, humidity, wind, solar, precip

Rank-

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

Rank-

Station report

The weather at Des Moines, drawn

The nearest airport reporting now, 16.3 mi from St. Marys. From its report of Sep 27, 2026, 4:10 AM local time: 3 of its 6 sheets.

The sky

Broken at 400 ft, overcast at 4,100 ft; the ceiling is 400 ft; visibility 8 mi.

Section of the sky over Des Moines, height above the station to scale: broken cloud with its base at 400 feet, overcast cloud with its base at 4,100 feet, the ceiling at 400 feet, and visibility of 8 mi.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 STATION01,0002,0003,0004,0005,0006,0007,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 4,100 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 400 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 400 FTVISIBILITY, MILES: 8 MI0510TITLEDes Moines, the skySTATION REPORT · ASOS DSMTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-DSM-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

61.0 F with a dew point of 60.0 F, 97 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 200 ft up; the lowest cloud reported is at 400 ft.

Chart of the air at Des Moines: temperature 61.0 degrees Fahrenheit and dew point 60.0, 97 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 200 feet above the station, against the lowest cloud reported at 400 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 STATION01,0002,0003,00050 F60 F70 FSATURATES 200 FT ABOVE THE STATION, AT 59.7 FLOWEST CLOUD REPORTED, BKN 400 FTTEMPERATURE AND DEW POINT 61.0 F, 60.0 FRELATIVE HUMIDITY 97 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 6DATE2026-09-27IDSR-DSM-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the southeast (140 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Des Moines, north up: blowing from 140 degrees, the southeast, at 5 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light 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 140°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEDes Moines, the windSTATION REPORT · ASOS DSMTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-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 26 Sep, 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.