Belle Fourche, SD Weather

Butte County1:06 AM MDT44.67°N, 103.85°WElevation 3,022 ft

Current conditions

Clear
50°
Clear
Feels like 46°
High 72°·Low 39° tonight
WindW 9 mph
Humidity62%
Dew point37°
Visibility10.0 mi
Cloud cover4%
UV index0 Low
Sunrise7:19 AM
Sunset6:02 PM

Observed at Spearfish / Clyde Ice · 31 min ago

Forecast

10-day

  • Tonight

    Clear, with a low around 39. West wind 1 to 8 mph.

  • Wednesday

    Sunny. High near 72, with temperatures falling to around 67 in the afternoon. East wind 1 to 16 mph, with gusts as high as 25 mph.

  • Wednesday Night

    Mostly clear. Low around 46, with temperatures rising to around 49 overnight. Southeast wind 3 to 15 mph, with gusts as high as 25 mph.

National Weather Service forecast updated 5 hrs ago.

Hourly

Hourly forecast
  1. Now Clear 46°
  2. 2 AM Clear 44°
  3. 3 AM Clear 43°
  4. 4 AM Clear 41°
  5. 5 AM Clear 40°
  6. 6 AM Sunny 40°
  7. 7 AM Sunny 40°
  8. 8 AM Sunny 42°
  9. 9 AM Sunny 47°
  10. 10 AM Sunny 53°
  11. 11 AM Sunny 57°
  12. 12 PM Sunny 62°
  13. 1 PM Sunny 66°
  14. 2 PM Sunny 69°
  15. 3 PM Sunny 71°
  16. 4 PM Sunny 70°
  17. 5 PM Sunny 67°
  18. 6 PM Mostly Clear 64°
  19. 7 PM Mostly Clear 61°
  20. 8 PM Mostly Clear 57°
  21. 9 PM Clear 55°
  22. 10 PM Clear 54°
  23. 11 PM Clear 53°
  24. Thu12 AM Clear 53°

10-day forecast

Details
  1. TonightOct 20 Clear Clear39°
  2. TodayOct 21 Sunny Sunny46°72°
  3. ThuOct 22 Mostly Sunny Mostly Sunny54°80°
  4. FriOct 23 Partly Sunny Partly Sunny21%40°77°
  5. SatOct 24 Mostly Sunny Mostly Sunny33°54°
  6. SunOct 25 Sunny Sunny32°55°
  7. MonOct 26 Sunny Sunny31°51°
  8. TueOct 27 Mostly Sunny Mostly Sunny10%57°
  9. WedOct 28 Partly cloudy Partly cloudy32°56°
  10. ThuOct 29 Mostly sunny Mostly sunny39°63°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news in South Dakota

More weather news

Air quality

30
Good
Ozone

Air quality is satisfactory, and air pollution poses little or no risk.

Rapid City, SD reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:19 AM
Sunset 6:02 PM
Daylight 10 h 43 min (−2 min 56 s tomorrow)
Waxing Gibbous · 75% lit
Moonrise 3:53 PM Moonset 2:11 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low55° / 33°
Record high83° (1974)
Record low11° (1906)
Wettest1.35 in (1931)
Yesterday68° / 45°
Month to date0.80 in (normal 1.53 in)

Spearfish, records since 1893. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in UNR, issued 2 hrs ago

Key Messages

- Warm and dry weather through much of this week.

Update

Issued at 1058 PM MDT Tue Oct 20 2026

No major changes to the forecast this evening. Surface analysis shows a weak cold front crossing NW SD at this time. Across SW SD, temps are in the mid to upper 50s while over NW SD into portions of NE WY temps are dropping into the upper 40s. NW winds will continue overnight into Wed morning, then return flow sets up as the surface high pushes east of the CWA Wed afternoon. Max temps on Wed will be in the 60s to low 70s...but then a decent overnight LLJ/warm air advection will push highs on Thursday well above average (upper 70s to possibly mid 80s over the western SD plains).

Discussion

(This Evening Through Tuesday) Issued at 1254 PM MDT Tue Oct 20 2026

Current upper level analysis shows broad ridging over the central and western US with deepening trof off the west coast. The CWA sits under upper level southwest flow and clear skies. Sfc stations report light southerly winds across much of western SD with temperatures in the 60s to low 70s.

Weak front will cross the CWA overnight with the only impacts being a slight drop in tomorrow's highs and a brief period of breezy northwest winds overnight. Upper ridge builds over the region Wednesday into Thursday with southerly return flow supporting warming temps over the area.

Southerly winds pick up early Friday morning as upper level trof approaches with attendant sfc low and trailing cold front crossing the Northern Plains. WAA ahead of the front Friday afternoon will support highs in the upper 70s to low 80s over the western SD plains. As the front crosses the area later Friday evening, winds will shift to the northwest but remain breezy through the night, especially over northwestern SD. Much cooler conditions expected over the weekend with low chances for light precip.

Aviation

(For the 06Z TAFS Through 06Z Wednesday Night) Issued At 1040 PM MDT Tue Oct 20 2026

VFR conditions are expected through the forecast period.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.