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St. Louis, Michigan

City in Gratiot County, Michigan

Air quality

The air at St. Louis

Index 16, good, led by ozone. Read at 5 AM from its reporting area, Mt Pleasant (MI), 26 miles off.

16Good
  • Fine particles (PM2.5)13Good-
  • Ozone16Good-
  • Coarse particles (PM10)5Good-

The days ahead

Good each day through Today, led by ozone. Yesterday measured 23, good.

Smoke, the next 46 hours

No smoke near the ground through Sun 2 AM.

FriSat

Precipitation

What has fallen at St. Louis

0.20 in in the last 24 hours, and none in the 2 days before, to Fri 4 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.20in
Last 3 days
0.20in

Visibility

How far you can see at St. Louis, the next 46 hours

Visibility stays 6 miles or more through Sun 2 AM, lowest 7 miles Fri 10 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest St. Louis, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.6 miles away.

measured now4 instruments

Alma [CCOOP]ALMM4

At a river or reservoir gauge/3.9 mi away/768 ft/27 ft above here

temp, wind, gust, humidity, pressure

Rank220of 979

AlmaAMN

At an airfield/7.6 mi away/754 ft/13 ft above here

temp, wind, gust, visibility, precip, pressure

Rank250of 979

M57Mm0320MC146

Beside a road/24.1 mi away/794 ft/53 ft above here

temp, pavement temp, wind, visibility, precip

Rank-

measured daily2 instruments

Alma 0.3 NWMI-GR-3

In a volunteer observer's own ground/3.6 mi away/738 ft/3 ft below here

precip, snowfall, snow depth

Rank-

Oil CityOILM4

At a cooperative observer's station/14.1 mi away/679 ft/62 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Alma, drawn

The nearest airport reporting now, 7.6 mi from St. Louis, Michigan. From its report of Oct 16, 2026, 5:35 AM local time: 3 of its 6 sheets.

The sky

Overcast at 1,100 ft; the ceiling is 1,100 ft; visibility 10 mi or more.

Section of the sky over Alma, height above the station to scale: overcast cloud with its base at 1,100 feet, the ceiling at 1,100 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT AMNFIG. A THE SKY OVER ALMASECTION, 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 1,100 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 1,100 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEAlma, the skySTATION REPORT · ASOS AMNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-AMN-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

53.6 F with a dew point of 51.8 F, 94 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 400 ft up; the lowest cloud reported is at 1,100 ft.

Chart of the air at Alma: temperature 53.6 degrees Fahrenheit and dew point 51.8, 94 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 400 feet above the station, against the lowest cloud reported at 1,100 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT AMNFIG. B THE AIR AT ALMATHE 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 FSATURATES 400 FT ABOVE THE STATION, AT 51.3 FLOWEST CLOUD REPORTED, OVC 1,100 FTTEMPERATURE AND DEW POINT 53.6 F, 51.8 FRELATIVE HUMIDITY 94 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 POINTTITLEAlma, the airSTATION REPORT · ASOS AMNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-AMN-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (290 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 24 mph.

Plan of the wind at Alma, north up: blowing from 290 degrees, the west northwest, at 12 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT AMNFIG. C THE WIND AT ALMAPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 290°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAlma, the windSTATION REPORT · ASOS AMNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-AMN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-

Snow on the ground

Elsewhere in Michigan

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

Near St. Louis

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

Near St. Louis

River and lake gauges