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Keystone, SD 57751 Weather

Today: Mostly Sunny, high 61°F, low 39°F. Hourly and 10-day forecast from the National Weather Service. Times are local (MDT).

Keystone, SD 57751 current weather

57°F

Mostly Sunny

Forecast for this hour. No recent report from a nearby station.

H 61° / L 39°

  • No rain expected in the next 12 hours

No recent station report. NWS hourly forecast updated 10/29/2026, 2:36 PM PT

Hourly forecast

NWS, updated 10/29/2026, 2:36 PM PT

  1. Now57°
  2. 6 PM47°
  3. 7 PM46°
  4. 8 PM44°
  5. 9 PM43°
  6. 10 PM42°
  7. 11 PM41°
  8. 12 AM41°Fri
  9. 1 AM41°
  10. 2 AM41°
  11. 3 AM41°
  12. 4 AM41°
  13. 5 AM41°
  14. 6 AM40°
  15. 7 AM39°
  16. 8 AM41°
  17. 9 AM45°
  18. 10 AM48°
  19. 11 AM50°
  20. 12 PM50°
  21. 1 PM50°
  22. 2 PM50°
  23. 3 PM50°
  24. 4 PM50°
  25. 5 PM49°
  26. 6 PM49°12%
  27. 7 PM49°12%
  28. 8 PM48°12%
  29. 9 PM48°12%
  30. 10 PM49°12%
  31. 11 PM48°12%
  32. 12 AM48°Sat
  33. 1 AM48°
  34. 2 AM48°
  35. 3 AM49°
  36. 4 AM49°
  37. 5 AM49°
  38. 6 AM48°
  39. 7 AM48°
  40. 8 AM49°
  41. 9 AM52°
  42. 10 AM55°
  43. 11 AM58°
  44. 12 PM61°
  45. 1 PM62°
  46. 2 PM63°
  47. 3 PM62°
  48. 4 PM60°

10-day forecast

Tap a day for details

  • Today10/29Low 39°High 61°

    This Afternoon: Mostly sunny. High near 61, with temperatures falling to around 57 in the afternoon. East wind around 1 mph.

    Tonight: Mostly cloudy. Low around 39, with temperatures rising to around 41 overnight. Northwest wind around 2 mph.

    Mostly Sunny
  • Fri10/3012% chance of precipitationLow 47°High 50°

    Friday: Mostly cloudy, with a high near 50. South wind 1 to 7 mph, with gusts as high as 20 mph.

    Friday Night: Patchy fog before midnight. Mostly cloudy. Low around 47, with temperatures rising to around 49 overnight. South wind around 5 mph.

    Mostly Cloudy
  • Sat10/31Low 45°High 63°

    Saturday: Mostly sunny. High near 63, with temperatures falling to around 56 in the afternoon. South wind around 7 mph, with gusts as high as 20 mph.

    Saturday Night: Mostly cloudy, with a low around 45. Southwest wind around 3 mph.

    Mostly Sunny
  • Sun11/182% chance of precipitationLow 48°High 60°

    Sunday: A chance of rain after 5pm. Partly sunny, with a high near 60.

    Sunday Night: Rain. Mostly cloudy, with a low around 48.

    Partly Sunny then Chance Light Rain
  • Mon11/269% chance of precipitationLow 40°High 52°

    Monday: Rain likely. Mostly cloudy, with a high near 52.

    Monday Night: A chance of rain. Mostly cloudy, with a low around 40.

    Light Rain Likely
  • Tue11/322% chance of precipitationLow 37°High 52°

    Tuesday: A slight chance of rain before 11am. Partly sunny, with a high near 52.

    Tuesday Night: Mostly cloudy, with a low around 37.

    Slight Chance Light Rain then Partly Sunny
  • Wed11/4Low 31°High 49°

    Wednesday: Partly sunny, with a high near 49.

    Wednesday Night: Partly cloudy, with a low around 31.

    Partly Sunny
  • Thu11/5Model blend11% chance of precipitationLow 37°High 50°

    Thursday: Partly cloudy. High near 50°. Low that night near 37°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Fri11/6Model blend16% chance of precipitationLow 38°High 49°

    Friday: Partly cloudy, slight chance of rain. High near 49°. Low that night near 38°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Sat11/7Model blendLow 37°High 51°

    Saturday: Partly cloudy. High near 51°. Low that night near 37°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

Forecast for 43.876, -103.390 from the NWS UNR office, updated 10/29/2026, 2:36 PM PT · Official forecast on weather.gov

Days 8 to 10: NOAA National Blend of Models, station KUNR (Rapid City, 16 mi), model run 10/29/2026, 2:00 PM MDT

From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.

Next 6 hours

NWS hourly forecast

  1. Now57°Mostly Sunny0%1 mph
  2. 6 PM47°Mostly Cloudy1%1 mph
  3. 7 PM46°Mostly Cloudy1%1 mph
  4. 8 PM44°Mostly Cloudy1%1 mph
  5. 9 PM43°Partly Cloudy1%2 mph
  6. 10 PM42°Partly Cloudy1%2 mph

Hourly details

Next 7 days: temperature chart, feels like, rain and snow amounts, sky cover, wind and gustsShow

Radar and satellite

National radar

NEXRAD (up to 24 hours) and GOES

Latest

Frequently asked questions

What is the high temperature today in Keystone, SD 57751?
The National Weather Service forecast for this afternoon calls for a high near 61°F. Mostly Sunny.
Will it rain in Keystone, SD 57751 in the next 24 hours?
The NWS hourly forecast does not show any hour with a 50% or higher chance of precipitation in the next 24 hours.
What is the 10-day forecast for Keystone, SD 57751?
The first 7 days come from the National Weather Service forecast. Days 8 to 10 (Nov 5 to Nov 7) come from the NOAA National Blend of Models, with highs of 49°F to 51°F. Model guidance this far out often changes.
What time is sunrise and sunset in Keystone, SD 57751 today?
Sunrise is about 7:26 AM MDT and sunset is about 5:48 PM MDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Keystone, SD 57751?
At Mt Rushmore Nmem, the 1991 to 2020 normal high in October is 55°F and the normal low is 37°F.

Nearby hazards

South Dakota hazards

Severe storm and flash flood outlooks, expected rain, river flooding and wildfires near this area

  • Severe storm outlook today:No thunderstorm risk area over this locationOutlook map
  • Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
  • River gauges within 40 miles at or above flood stage: None reported
  • Active wildfires within 50 miles: None reported

Drought

By county

Pennington County, week of 10/27/2026

100% of the county is in moderate drought or worse.

Sun and moon

Local time, center of the area

Sunrise
7:26 AM
Sunset
5:48 PM
Daylight
10 hr 22 min
Moon
Waning Gibbous 84% lit
First light (civil dawn)
6:56 AM
Last light (civil dusk)
6:17 PM
Moonrise
8:07 PM
Moonset
11:54 AM

Normal October weather

Climate

Normal October high 55°, low 37°, precipitation 1.80 in for the month. 1991 to 2020 normals at Mt Rushmore Nmem, 3 mi away.

Other places nearby

Data sources

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About this data

Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.

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