Spearfish climate

Spearfish Weather in August

NOAA 1991-2020 normals for Spearfish, 1.2 km from Spearfish

Average highs run from 85°F on August 1 to 80°F on August 31, and lows from 58°F to 53°F. Normal precipitation for the month is 1.88 in over about 7 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Spearfish, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
83°F
Average low
56°F
Precipitation
1.88 in
Record high
104°FAug 1, 1900
Record low
32°FAug 26, 1906
Chance of a freeze
0%
Days of 90°F or more
8.5
Daylight
14 h 38 min to 13 h 16 min
Cloud cover
45%
Humidity
51%
Dew point
49°F
Wind
7.2 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 185°F58°F104°F 190042°F 192027%0%
Aug 285°F58°F102°F 193843°F 201827%0%
Aug 385°F58°F104°F 193439°F 197827%0%
Aug 485°F58°F104°F 194141°F 195226%0%
Aug 584°F58°F103°F 194139°F 190626%0%
Aug 684°F58°F100°F 189341°F 190626%0%
Aug 784°F58°F101°F 194942°F 198525%0%
Aug 884°F58°F104°F 197541°F 190625%0%
Aug 984°F58°F102°F 195841°F 191725%0%
Aug 1084°F57°F103°F 193533°F 191725%0%
Aug 1184°F57°F103°F 200040°F 190224%0%
Aug 1284°F57°F104°F 193838°F 192024%0%
Aug 1384°F57°F102°F 189340°F 196624%0%
Aug 1483°F57°F101°F 193544°F 198523%0%
Aug 1583°F57°F101°F 192947°F 196623%0%
Aug 1683°F56°F98°F 190645°F 189323%0%
Aug 1783°F56°F100°F 195940°F 194423%0%
Aug 1883°F56°F101°F 195941°F 198522%0%
Aug 1983°F56°F101°F 194841°F 192022%0%
Aug 2083°F56°F100°F 198637°F 192022%0%
Aug 2182°F55°F99°F 189439°F 195122%0%
Aug 2282°F55°F102°F 201039°F 196621%0%
Aug 2382°F55°F102°F 193738°F 196621%0%
Aug 2482°F55°F98°F 197636°F 191021%0%
Aug 2582°F54°F99°F 200037°F 191021%0%
Aug 2681°F54°F102°F 192632°F 190621%0%
Aug 2781°F54°F101°F 193739°F 190621%0%
Aug 2881°F54°F99°F 192433°F 191121%0%
Aug 2981°F53°F99°F 195037°F 192021%0%
Aug 3080°F53°F101°F 194833°F 192021%0%
Aug 3180°F53°F102°F 195437°F 190820%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Spearfish, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

August 1
sunrise 5:42 AM, sunset 8:20 PM
August 31
sunrise 6:17 AM, sunset 7:33 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00397882 (Spearfish), public domain. Records: NOAA GHCN-Daily, station USC00397882, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.