Spearfish, South Dakota 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Spearfish SD
National Weather Service Forecast for:
Spearfish SD
Issued by: National Weather Service Rapid City, SD |
Updated: 6:52 pm MDT Mar 30, 2025 |
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Tonight
 Snow Likely and Patchy Fog then Patchy Fog
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Monday
 Mostly Cloudy
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Monday Night
 Chance Showers
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Tuesday
 Chance Rain/Snow then Rain/Snow
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Tuesday Night
 Rain/Snow then Snow
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Wednesday
 Snow
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Wednesday Night
 Chance Snow then Mostly Cloudy
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Thursday
 Partly Sunny then Chance Rain/Snow
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Thursday Night
 Chance Rain/Snow then Slight Chance Snow Showers
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Lo 26 °F |
Hi 50 °F |
Lo 32 °F |
Hi 44 °F |
Lo 28 °F |
Hi 35 °F |
Lo 27 °F |
Hi 42 °F |
Lo 27 °F |
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Hazardous Weather Outlook
Tonight
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Snow likely, mainly before 9pm. Patchy fog after 9pm. Otherwise, cloudy, with a low around 26. Calm wind. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible. |
Monday
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Mostly cloudy, with a high near 50. Light and variable wind becoming east 5 to 10 mph in the morning. Winds could gust as high as 21 mph. |
Monday Night
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A 40 percent chance of showers. Mostly cloudy, with a low around 32. East wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph. |
Tuesday
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A chance of rain and snow before 10am, then rain between 10am and 4pm, then rain, possibly mixed with snow after 4pm. High near 44. Light and variable wind becoming northeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 80%. Little or no snow accumulation expected. |
Tuesday Night
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Snow, possibly mixed with rain, becoming all snow after 9pm. Low around 28. North wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible. |
Wednesday
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Snow. High near 35. Northwest wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible. |
Wednesday Night
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A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 27. Northwest wind 6 to 11 mph becoming light and variable after midnight. Winds could gust as high as 21 mph. |
Thursday
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A chance of snow showers after noon, mixing with rain after 2pm. Partly sunny, with a high near 42. Calm wind becoming northeast around 6 mph in the afternoon. |
Thursday Night
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A chance of rain and snow showers before 9pm, then a chance of snow showers. Partly cloudy, with a low around 27. |
Friday
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A chance of rain and snow showers before 4pm, then a chance of rain showers between 4pm and 5pm, then a chance of rain and snow showers after 5pm. Partly sunny, with a high near 43. |
Friday Night
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A slight chance of rain and snow showers. Partly cloudy, with a low around 27. |
Saturday
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A slight chance of rain and snow showers. Mostly sunny, with a high near 48. |
Saturday Night
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Partly cloudy, with a low around 28. |
Sunday
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Mostly sunny, with a high near 49. |
Forecast from NOAA-NWS
for Spearfish SD.
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Weather Forecast Discussion
821
FXUS63 KUNR 302311
AFDUNR
Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
511 PM MDT Sun Mar 30 2025
.KEY MESSAGES...
-Light snow will continue into the evening over far western SD
into Northeast WY, with little to no accumulation expected
-A series of disturbances will bring chances for rain/snow to the
region through much of the week
-A stronger disturbance will bring a good chance of rain and snow
to the region Tues, with snow accumulations possible Tues night
-Temperatures to remain mainly below seasonal norms through the
week
&&
.DISCUSSION...(This Evening Through Sunday)
Issued at 149 PM MDT Sun Mar 30 2025
Potent Pac upper jet continues to support unsettled flow over the
Pac, bringing a series of impulses into the western CONUS. This
pattern will continue through the week, with several rounds of Pac
systems into the region. Weak impulse continues to move east
across the region today with another around of light snow moving
across northeast WY and far western SD. Light snow will move east
and diminish through evening, with little to no accums expected.
Cool and moist easterly upslope flow will continue overnight with
widespread low clouds. Patchy fog will also be possible along the
north and east slopes of the Black Hills. Deeper trough will move
into the western CONUS Monday and support increasing return flow
over the region. Gusty southeast winds will develop Monday with
some gusts over 40 mph possible across far NW SD. Temps will
struggle into 30s/40s given cloud cover and moist upslope flow,
with the warmest temps in western Campbell County where the BL
will mix out. Weak impulse will traverse the flow ahead of this
system with associated steep lapse rates and will support
scattered rain or snow showers over the western third. Isolate
thunderstorms will also be possible from northeast WY into far
southwest SD in the late afternoon and early evening. This area of
lift will support slightly better chances for mostly rain on the
SD Plains Monday night where pos theta-e adv will ensue. Some
freezing rain or snow will also be possible across NW SD a well,
hinging on how the thermal fields set up. The main/stronger wave
will push out of the Rockies Tue and support a good chance of rain
and snow over the region. Rain will change to snow Tue night with
some potential for concentrated banding per steep mid level
lapses rates and a strong FGEN signal. Low confidence remains per
details WRT this system, given poor model consensus and the fact
that snow amounts will likely be driven by mesoscale processes.
After Wed, things dry out with just some chances for showers at
times as semi-unsettled westerly flow continues. Temps will also
moderate some by the end of the week, but still remain around
seasonal norms.
&&
.AVIATION...(For the 00Z TAFS Through 00Z Monday Evening)
Issued At 509 PM MDT Sun Mar 30 2025
Light snow will slowly taper off through the evening hours, with
snow ending from west to east after 01-04z. Otherwise, lingering
low clouds and fog will result in MVFR to LIFR conditions through
the 10-12z, before gradual improvement is expected to transient
VFR and MVFR conditions Monday morning into the afternoon hours.
&&
.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&
$$
DISCUSSION/KEY MESSAGES...JC
AVIATION...SE
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