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Hermosa, South Dakota

Town in Custer County, South Dakota

Air quality

The air at Hermosa

Index 34, good, led by ozone. Read at 6 PM from its reporting area, Rapid City (SD), 18 miles off.

34Good
  • Fine particles (PM2.5)0Good-
  • Ozone34Good-
  • Coarse particles (PM10)9Good-

The days ahead

Yesterday measured 36, good.

Smoke, the next 42 hours

Little smoke near the ground through Sun 12 PM: the index from smoke stays at 6 or under.

FriSatSun

Precipitation

What has fallen at Hermosa

None in the last 24 hours; 0.02 in over the last 3 days, to Fri 6 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.02in

Visibility

How far you can see at Hermosa, the next 42 hours

Visibility stays 10 miles or more through Sun 12 PM.

FriSatSun

On the radar over Hermosa, South DakotaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Hermosa, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now4 instruments

Rapid CityRAP

At an airfield/15.7 mi away/3,165 ft/153 ft below here

temp, wind, gust, visibility, precip, pressure

Rank286of 817

measured daily2 instruments

Station report

The weather at Rapid City, drawn

The nearest airport reporting now, 15.7 mi from Hermosa, South Dakota. From its report of Oct 16, 2026, 6:52 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 Rapid City, 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 RAPFIG. A THE SKY OVER RAPID CITYSECTION, 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 MORE0510TITLERapid City, the skySTATION REPORT · ASOS RAPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-RAP-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

48.0 F with a dew point of 25.0 F, 40 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,200 ft up.

Chart of the air at Rapid City: temperature 48.0 degrees Fahrenheit and dew point 25.0, 40 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,200 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RAPFIG. B THE AIR AT RAPID CITYTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00010 F20 F30 F40 F50 F60 FSATURATES 5,200 FT ABOVE THE STATION, AT 20.3 FTEMPERATURE 48.0 FDEW POINT 25.0 FSPREAD 23.0 FRELATIVE HUMIDITY 40 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 POINTTITLERapid City, the airSTATION REPORT · ASOS RAPTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-RAP-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (180 degrees) at 15 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 43 mph.

Plan of the wind at Rapid City, north up: blowing from 180 degrees, the south, at 15 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RAPFIG. C THE WIND AT RAPID CITYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 180°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 15 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLERapid City, the windSTATION REPORT · ASOS RAPTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-RAP-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Mount Rushmore National Memorial (RNMS2), 13.2 miles from here, read 15 Oct, 23:59. measured daily

Elsewhere in South Dakota

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

Near Hermosa

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

Near Hermosa

River and lake gauges