Spearfish, South Dakota Weather Conditions

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Current Conditions

  • 34°
  • Clear
  • Wind: West 7 mph
  • Humidity: 56%
  • Visibility: 10.0 miles
  • Dew Point: 19°
  • Pressure: 29.99 in. -
  • Heat Index: 28

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Next 12 Hours

12  am
3  am
6  am
9  am
12  pm
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Clear
Clear
28°
28°
28°
28°
39°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Partly Cloudy
  • High: 43 °
  • Low: 25 °
  • Partly Cloudy
  • Saturday
  • Partly Cloudy
  • High: 39 °
  • Low: 27 °
  • Partly Cloudy
  • Sunday
  • Chance of Snow
  • High: 43 °
  • Low: 32 °
  • Chance of Snow
  • Monday
  • Chance of Snow
  • High: 39 °
  • Low: 19 °
  • Chance of Snow
  • Tuesday
  • Partly Cloudy
  • High: 36 °
  • Low: 21 °
  • Partly Cloudy

Forecast for Spearfish, South Dakota

Updated: 9:00 PM CST on December 18, 2014

  • Thursday

    Partly cloudy. High of 39F with a windchill as low as 19F. Winds from the WSW at 5 to 10 mph.

  • Thursday Night

    Partly cloudy. Low of 25F. Winds from the WSW at 5 to 10 mph.

  • Friday

    Partly cloudy in the morning, then clear. High of 43F. Winds from the WSW at 5 to 10 mph.

  • Friday Night

    Partly cloudy. Low of 25F. Winds from the SW at 5 to 10 mph.

  • Saturday

    Partly cloudy. High of 39F with a windchill as low as 23F. Winds from the West at 5 to 15 mph.

  • Saturday Night

    Partly cloudy. Low of 27F with a windchill as low as 21F. Winds from the SW at 5 to 10 mph.

  • Sunday

    Partly cloudy with a chance of snow and a chance of rain in the morning, then overcast with a chance of snow and a chance of rain. High of 43F. Winds from the WSW at 10 to 15 mph. Chance of snow 20%.

  • Sunday Night

    Partly cloudy with a chance of snow and a chance of rain in the evening, then overcast. Low of 32F with a windchill as low as 21F. Winds from the West at 10 to 15 mph.

  • Monday

    Mostly cloudy with a chance of snow and rain showers, then a chance of rain in the afternoon. High of 39F with a windchill as low as 25F. Breezy. Winds from the WNW at 10 to 20 mph. Chance of precipitation 40% with accumulations up to 1 in. possible.

  • Monday Night

    Overcast in the evening, then mostly cloudy with a chance of snow. Low of 19F. Breezy. Winds from the WNW at 10 to 20 mph. Chance of snow 20%.

  • Tuesday

    Partly cloudy. Fog early. High of 36F with a windchill as low as 7F. Breezy. Winds from the WNW at 20 to 25 mph.

  • Tuesday Night

    Partly cloudy. Low of 21F. Breezy. Winds from the WSW at 10 to 20 mph.

  • Wednesday

    Partly cloudy. High of 34F with a windchill as low as 5F. Windy. Winds from the WNW at 20 to 30 mph.

  • Wednesday Night

    Mostly cloudy. Low of 9F with a windchill as low as -2F. Breezy. Winds from the NW at 10 to 20 mph.

  • Thursday

    Overcast. High of 23F with a windchill as low as 0F. Breezy. Winds from the NW at 10 to 20 mph.

  • Thursday Night

    Partly cloudy. Low of 16F with a windchill as low as -6F. Breezy. Winds from the WNW at 15 to 20 mph.

  • Friday

    Mostly cloudy. High of 18F with a windchill as low as 1F. Breezy. Winds from the WNW at 10 to 25 mph.

  • Friday Night

    Partly cloudy. Low of 9F with a windchill as low as 1F. Winds from the WNW at 5 to 15 mph.

  • Saturday

    Clear. High of 25F with a windchill as low as -2F. Winds from the WNW at 5 to 10 mph.

  • Saturday Night

    Clear. Low of 7F with a windchill as low as -4F. Winds from the WNW at 5 to 10 mph.

  • Sunday

    Clear. High of 18F with a windchill as low as 1F. Winds from the WNW at 5 to 10 mph.

  • Sunday Night

    Clear. Low of 9F with a windchill as low as 0F. Winds from the WNW at 5 to 10 mph.

  • Monday

    Clear. High of 16F with a windchill as low as -2F. Winds from the WNW at 5 to 10 mph.

  • Monday Night

    Clear. Low of 9F with a windchill as low as -2F. Winds from the WNW at 5 to 10 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: TMWC, Spearfish, SD

Updated: 9:35 PM MST

Temperature: 35.1 °F Dew Point: 20 °F Humidity: 53% Wind: SSW at 6.9 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Windchill: 29 °F Graphs

Location: Mountain Plains I, Spearfish, SD

Updated: 9:32 PM MST

Temperature: 33.6 °F Dew Point: 17 °F Humidity: 50% Wind: West at 8.1 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Windchill: 27 °F Graphs

Location: Green Acres, Spearfish, SD

Updated: 9:35 PM MST

Temperature: 34.0 °F Dew Point: - Humidity: - Wind: North at - Pressure: - Hourly Precipitation: - Windchill: 34 °F Graphs

Location: Spearfish, SD

Updated: 7:04 PM MST

Temperature: 39.2 °F Dew Point: 20 °F Humidity: 46% Wind: West at 5.4 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Windchill: 35 °F Graphs

Location: Dumont Trailhead, Lead, SD

Updated: 9:34 PM MST

Temperature: 26.3 °F Dew Point: 18 °F Humidity: 69% Wind: West at 3.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion for western South Dakota and northeastern Wyoming 
National Weather Service Rapid City South Dakota 
923 PM MST Thursday Dec 18 2014 


Update... 
issued at 731 PM MST Thursday Dec 18 2014 


Patchy fog is forming near the western edge of stratus that is slowly 
pushing east of the County warning forecast area. Will add patchy fog to our far eastern zones 
for the rest of the night...although it may clear a bit earlier 
with drier SW/west flow expected to develop overnight. 


&& 


Short term...tonight and tomorrow 
issued at 238 PM MST Thursday Dec 18 2014 


Upper level trough continues to move across the northern 
plains...with the trough axis sliding into the eastern Dakotas. 
Eroding of the low clouds continues to spread across western S 
Dakota...with most of the County Warning Area now seeing mostly sunny skies and 
temperatures above freezing. With mostly clear skies continuing into the 
evening hours temperatures will fall quickly into the 20s after sunset. 
Temperatures bottom out in the teens to lower 20s. Tomorrow a week 
disturbance will move across the area. Soundings are fairly dry in 
the lower levels and expect only some passing middle/high clouds. This 
should not impede much on warming with highs in the 30s to lower 40s. 


Long term...Friday night through Thursday 
issued at 238 PM MST Thursday Dec 18 2014 


Primary forecast concerns in the Middle Range of the forecast deal with 
light snow chances over northeast Wyoming Saturday morning and with 
a slight warming trend in temperatures through the weekend. Focus 
then turns to the pattern shift for next week as it turns active for 
much of next week. 


A shortwave trough drops southeast across South Dakota Friday night 
with another shortwave trough from the Pacific crossing the northern 
rockies and into northeast Wyoming by 12z Saturday. The first system 
will move through dry as there is a large lack of moisture to work 
with...but there may be enough moisture still with the second system 
after crossing the mountains to bring some light precipitation to 
the northeast corner of Wyoming Saturday morning. The GFS has a 
clear dry layer just off the surface so may not be enough moisture 
to make it through the boundary layer for measurable precipitation. 
The NAM is not as robust with the dry air but would indicate there 
may be enough lift and moisture to at least include a slight mention 
of snow Saturday morning. 


Temperatures will see a slight moderation through the weekend. 
Behind the weak Pacific front that moves though Saturday morning 
warmer air will begin to push north as longwave ridging builds over 
the eastern Pacific. By Sunday...a large area of low pressure at the 
surface develops over southwest Canada with a trough extending south 
along the Front Range of the Rocky Mountains. Southerly flow in the 
lower levels will bring warmer air northward...with highs expected 
to rise into the low and middle 40s across portions of the forecast 
area on both Saturday and Sunday. A question with temperatures will 
be if and/or how much of an impact the snow cover will impact 
temperatures. Kept highs a bit cooler where snowpack exists...while 
other areas should easily rise into the 30s and 40s. 


By Monday...northwest flow aloft has been established across the 
north central part of the Continental U.S. As the upper level pattern changes 
with a longwave ridge over the eastern Pacific and a fairly deep 
trough centered across the plains and Mississippi River valley. The 
models are in good agreement with this pattern change which looks to 
stay in place through the week. This pattern will keep the weather 
active through the remainder of the period as multiple weak 
shortwave troughs push over the ridge and pass across the local 
area. Timing of the individual systems is problematic as is 
typically seen in these patterns so it is quite difficult trying to 
pinpoint when the higher chances for precipitation will be. This 
leads to precipitation chances through most days Monday through 
Thursday. With the northwest flow though...will get upslope flow 
over the Black Hills much of the period so as long as there is some 
moisture to work with will get snow to develop and these areas will 
maintain the more consistent and higher precipitation chances. 
Amounts Don/T look significant with any of these quick hitting 
systems at this point so the current forecast just has light amounts 
currently. By Wednesday night and Thursday the models are digging a 
slightly more significant shortwave down through the central 
rockies. If this holds out...the precipitation will be mostly across 
the southwest part of the forecast area. 


One thing that is fairly certain is as the northwest flow is 
established that temperatures will be cooling off back to near 
normal levels...and colder by late next week with highs likely in 
the low to middle 20s by Thursday. 


&& 


Aviation...(for the 06z tafs through 06z Friday night) 
issued at 921 PM MST Thursday Dec 18 2014 


VFR conditions for both krap and kgcc expected the next 24 hours. 
MVFR ceilings along with patchy IFR fog across parts of northwestern through 
central South Dakota will shift east of the area overnight. 


&& 


Unr watches/warnings/advisories... 
South Dakota...none. 
Wyoming...none. 
&& 


$$ 


Update...Johnson 
short term...masek 
long term...Brooks 
aviation...Johnson 



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