Storm Station
Keystone, South Dakota
57° 63°/49°
Clear· Feels like 57°·Light air 3 mph W
Partly cloudy, with a low around 51. Northwest wind around 3 mph.
0UV Low
34Air quality
56%Humidity
18%Cloud
Now
1:30 AM
57feels57
now, clear
Today
Sep 27
6349
17%
fog
Mon
Sep 28
7255
39%
drizzle
Tue
Sep 29
7256
30%
overcast
Wed
Sep 30
7151
18mph
overcast
Thu
Oct 1
6044
overcast
Fri
Oct 2
7346
19mph
overcast
Sat
Oct 3
7552
13%
21mph
overcast
57°
63°49°
72°55°
72°56°
71°51°
60°44°
73°46°
75°52°

As of 1:30 AM in Keystone, South Dakota.

What is measuring near here

The 5 instruments nearest Keystone, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.8 miles away.

measured now3 instruments

Mount Rushmore RAWSRHRS2

A remote fire weather station/2.4 mi away/5,272 ft/936 ft above here

temp, wind, gust, humidity, pressure

Rank66of 427

SD RWIS Three ForksSD067

Beside a road/6.1 mi away/4,731 ft/395 ft above here

temp, pavement temp, wind, visibility, precip

Rank-

CusterCUT

At an airfield/14.8 mi away/5,534 ft/1,198 ft above here

temp, wind, gust, visibility, precip, pressure

Rank18of 427

measured daily2 instruments

Keystone 5.9 ESESD-PN-110

In a volunteer observer's own ground/5.4 mi away/3,979 ft/357 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Custer, drawn

The nearest airport reporting now, 14.8 mi from Keystone. From its report of Sep 27, 2026, 12:53 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 11,000 ft; visibility 10 mi or more.

Section of the sky over Custer, height above the station to scale: a few clouds cloud with its base at 11,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CUTFIG. A THE SKY OVER CUSTERSECTION, 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 STATION02,5005,0007,50010,00012,50015,00017,500ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTFEW 11,000 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLECuster, the skySTATION REPORT · ASOS CUTTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-CUT-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014

The air

51.0 F with a dew point of 41.0 F, 68 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,300 ft up; the lowest cloud reported is at 11,000 ft.

Chart of the air at Custer: temperature 51.0 degrees Fahrenheit and dew point 41.0, 68 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,300 feet above the station, against the lowest cloud reported at 11,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CUTFIG. B THE AIR AT CUSTERTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00030 F40 F50 F60 FSATURATES 2,300 FT ABOVE THE STATION, AT 38.8 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, FEW 11,000 FTTEMPERATURE 51.0 FDEW POINT 41.0 FSPREAD 10.0 FRELATIVE HUMIDITY 68 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 POINTTITLECuster, the airSTATION REPORT · ASOS CUTTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-CUT-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northeast (30 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Custer, north up: blowing from 30 degrees, the north northeast, 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 CUTFIG. C THE WIND AT CUSTERPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 30°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECuster, the windSTATION REPORT · ASOS CUTTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-CUT-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Mount Rushmore National Memorial (RNMS2), 1.8 miles from here, read 26 Sep, 23:59. measured daily

Elsewhere in South Dakota

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

Near Keystone

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