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Sedan, Montana

Community in Gallatin County, Montana

Air quality

The air at Sedan

Index 31, good, led by fine particles. Read at 9 PM from its reporting area, Helena (MT), 71 miles off.

31Good
  • Fine particles (PM2.5)31Good-

The days ahead

Yesterday measured 34, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 6 PM.

FriSat

Precipitation

What has fallen at Sedan

None in the last 3 days, to Thu 9 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

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

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

On the radar over Sedan, MontanaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Sedan, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 8.0 miles away.

measured now5 instruments

measured daily2 instruments

Station report

The weather at Bozeman/Gallatin, drawn

The nearest airport reporting now, 20.7 mi from Sedan, Montana. From its report of Oct 15, 2026, 9:56 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Bozeman/Gallatin, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BZNFIG. A THE SKY OVER BOZEMAN/GALLATINSECTION, 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 SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEBozeman/Gallatin, the skySTATION REPORT · ASOS BZNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BZN-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

38.0 F with a dew point of 33.0 F, 82 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,100 ft up.

Chart of the air at Bozeman/Gallatin: temperature 38.0 degrees Fahrenheit and dew point 33.0, 82 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,100 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BZNFIG. B THE AIR AT BOZEMAN/GALLATINTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00020 F30 F40 F50 FSATURATES 1,100 FT ABOVE THE STATION, AT 31.9 FTEMPERATURE 38.0 FDEW POINT 33.0 FSPREAD 5.0 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 POINTTITLEBozeman/Gallatin, the airSTATION REPORT · ASOS BZNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BZN-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southeast (160 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Bozeman/Gallatin, north up: blowing from 160 degrees, the south southeast, at 6 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 BZNFIG. C THE WIND AT BOZEMAN/GALLATINPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 160°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEBozeman/Gallatin, the windSTATION REPORT · ASOS BZNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BZN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

2in

Snow on the ground

Measured at Bozeman Montana State Univ (BZEM8), 24.1 miles from here, read 15 Oct, 16:00. measured daily

Elsewhere in Montana

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

Near Sedan

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

Near Sedan

River and lake gauges