Bison, SD Weather

Perkins County10:25 PM CDT45.52°N, 102.46°WElevation 2,782 ft

Current conditions

Mostly Clear
51°
Mostly Clear
Feels like 51°
High 75° Thursday·Low 46° tonight
WindSE 13 mph gusts 23 mph
Humidity83%
Dew point46°
Cloud cover10%
UV index0 Low
Sunrise8:15 AM
Sunset6:56 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Wednesday Night

    Mostly clear, with a low around 46. Southeast wind 9 to 14 mph, with gusts as high as 24 mph.

  • Thursday

    Mostly sunny, with a high near 75. Southeast wind 12 to 16 mph, with gusts as high as 29 mph.

  • Thursday Night

    Mostly cloudy, with a low around 54. Southeast wind 12 to 18 mph, with gusts as high as 31 mph.

National Weather Service forecast updated 1 day ago.

Hourly

Hourly forecast
  1. Now Mostly Clear 51°
  2. 11 PM Mostly Clear 50°
  3. Thu12 AM Mostly Clear 49°
  4. 1 AM Mostly Clear 48°
  5. 2 AM Mostly Clear 48°
  6. 3 AM Mostly Clear 48°
  7. 4 AM Mostly Clear 48°
  8. 5 AM Mostly Clear 47°
  9. 6 AM Sunny 47°
  10. 7 AM Mostly Sunny 47°
  11. 8 AM Mostly Sunny 48°
  12. 9 AM Mostly Sunny 49°
  13. 10 AM Mostly Sunny 53°
  14. 11 AM Mostly Sunny 58°
  15. 12 PM Mostly Sunny 65°
  16. 1 PM Mostly Sunny 70°
  17. 2 PM Mostly Sunny 73°
  18. 3 PM Mostly Sunny 75°
  19. 4 PM Mostly Sunny 75°
  20. 5 PM Mostly Sunny 74°
  21. 6 PM Partly Cloudy 71°
  22. 7 PM Partly Cloudy 69°
  23. 8 PM Partly Cloudy 66°
  24. 9 PM Partly Cloudy 63°

10-day forecast

Details
  1. TueOct 20 Sunny Sunny39°70°
  2. TodayOct 21 Sunny Sunny46°64°
  3. ThuOct 22 Mostly Sunny Mostly Sunny54°75°
  4. FriOct 23 Partly Sunny then Slight Chance Rain Showers Partly Sunny then Slight Chance Rain Showers15%42°76°
  5. SatOct 24 Mostly Sunny Mostly Sunny13%33°52°
  6. SunOct 25 Sunny Sunny31°54°
  7. MonOct 26 Mostly Sunny Mostly Sunny31°51°
  8. TueOct 27 Mostly sunny Mostly sunny35°54°
  9. WedOct 28 Mostly sunny Mostly sunny30°47°
  10. ThuOct 29 Mostly sunny Mostly sunny27°43°

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 near Bison

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Sun & moon

Sunrise 8:15 AM
Sunset 6:56 PM
Daylight 10 h 40 min (−3 min 2 s tomorrow)
Waxing Gibbous · 82% lit
Moonrise 4:49 PM Moonset 3:04 AM
Full moon Oct 26 New moon Nov 9

Forecasters' discussion

From the National Weather Service office in UNR, issued 9 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 18Z TAFS Through 18Z Thursday) Issued At 1124 AM MDT Wed Oct 21 2026

VFR conditions are expected through the forecast period.

Main aviation changes will be centered around winds but overall concerns are low. Increased wind speeds, upwards of 10 to 20 kts, are likely through the tonight for NE WY and NW SD before a lull in speeds Thursday morning. Wind speeds increase again, up to 10 to 15 kts, for most of the area for Thursday afternoon.

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.