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Keystone, SD Weather

Tonight: Mostly Clear, low 38°F. Hourly and 10-day forecast from the National Weather Service. Times are local (MDT).

Keystone, SD current weather

38°F

Mostly Clear

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

H -- / L 38°

  • No rain expected in the next 12 hours

No recent station report. NWS hourly forecast updated 10/28/2026, 9:51 PM PT

Hourly forecast

NWS, updated 10/28/2026, 9:51 PM PT

  1. Now38°
  2. 12 AM38°Thu
  3. 1 AM39°
  4. 2 AM39°
  5. 3 AM39°
  6. 4 AM39°
  7. 5 AM39°
  8. 6 AM38°
  9. 7 AM38°
  10. 8 AM40°
  11. 9 AM45°
  12. 10 AM50°
  13. 11 AM55°
  14. 12 PM57°
  15. 1 PM59°
  16. 2 PM61°
  17. 3 PM61°
  18. 4 PM58°
  19. 5 PM52°
  20. 6 PM48°
  21. 7 PM45°
  22. 8 PM43°
  23. 9 PM42°
  24. 10 PM41°
  25. 11 PM41°
  26. 12 AM41°Fri
  27. 1 AM41°
  28. 2 AM41°
  29. 3 AM41°
  30. 4 AM41°
  31. 5 AM41°
  32. 6 AM40°
  33. 7 AM40°
  34. 8 AM42°
  35. 9 AM44°
  36. 10 AM47°
  37. 11 AM50°
  38. 12 PM52°
  39. 1 PM53°
  40. 2 PM54°
  41. 3 PM54°
  42. 4 PM52°
  43. 5 PM50°
  44. 6 PM48°
  45. 7 PM47°
  46. 8 PM47°
  47. 9 PM47°
  48. 10 PM47°

10-day forecast

Tap a day for details

  • Today10/28Low 38°High

    Tonight: Mostly clear, with a low around 38. Southwest wind around 5 mph.

    Mostly Clear
  • Thu10/29Low 39°High 63°

    Thursday: Sunny. High near 63, with temperatures falling to around 52 in the afternoon. Southwest wind 1 to 5 mph.

    Thursday Night: Partly cloudy. Low around 39, with temperatures rising to around 41 overnight. Northwest wind around 2 mph.

    Sunny
  • Fri10/30Low 46°High 55°

    Friday: Mostly sunny. High near 55, with temperatures falling to around 50 in the afternoon. South wind 0 to 6 mph, with gusts as high as 22 mph.

    Friday Night: Mostly cloudy, with a low around 46. South wind around 5 mph.

    Mostly Sunny
  • Sat10/31Low 47°High 64°

    Saturday: Mostly sunny. High near 64, with temperatures falling to around 57 in the afternoon. South wind around 5 mph, with gusts as high as 18 mph.

    Saturday Night: Partly cloudy, with a low around 47.

    Mostly Sunny
  • Sun11/171% chance of precipitationLow 42°High 61°

    Sunday: A chance of rain after 5pm. Partly sunny, with a high near 61.

    Sunday Night: Rain likely. Mostly cloudy, with a low around 42.

    Partly Sunny then Chance Light Rain
  • Mon11/265% chance of precipitationLow 38°High 43°

    Monday: Rain likely. Mostly cloudy, with a high near 43.

    Monday Night: Rain likely before 2am, then a chance of rain and snow. Mostly cloudy, with a low around 38.

    Light Rain Likely
  • Tue11/332% chance of precipitationLow 36°High 46°

    Tuesday: A chance of rain and snow. Partly sunny, with a high near 46.

    Tuesday Night: A slight chance of rain before 11pm, then a slight chance of rain and snow between 11pm and 5am. Mostly cloudy, with a low around 36.

    Chance Rain And Snow
  • Wed11/414% chance of precipitationLow High 46°

    Wednesday: Mostly sunny, with a high near 46.

    Mostly Sunny
  • Thu11/5Model blendLow 36°High 53°

    Thursday: Partly cloudy. High near 53°. Low that night near 36°.

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

  • Fri11/6Model blendLow 37°High 55°

    Friday: Partly cloudy. High near 55°. 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 43.890, -103.423 from the NWS UNR office, updated 10/28/2026, 9:51 PM PT · Official forecast on weather.gov

Days 9 to 10: NOAA National Blend of Models, station KUNR (Rapid City, 17 mi), model run 10/28/2026, 8:00 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. Now38°Mostly Clear0%2 mph
  2. 12 AM38°Mostly Clear0%2 mph
  3. 1 AM39°Mostly Clear0%2 mph
  4. 2 AM39°Partly Cloudy0%3 mph
  5. 3 AM39°Partly Cloudy0%5 mph
  6. 4 AM39°Mostly Clear0%5 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

Will it rain in Keystone, SD 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?
The first 8 days come from the National Weather Service forecast. Days 9 to 10 (Nov 5 to Nov 6) come from the NOAA National Blend of Models, with highs of 53°F to 55°F. Model guidance this far out often changes.
What time is sunrise and sunset in Keystone, SD today?
Sunrise is about 7:25 AM MDT and sunset is about 5:49 PM MDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Keystone, SD?
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 10/20/2026

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

Sun and moon

Local time, center of the area

Sunrise
7:25 AM
Sunset
5:49 PM
Daylight
10 hr 24 min
Moon
Waning Gibbous 90% lit
First light (civil dawn)
6:55 AM
Last light (civil dusk)
6:19 PM
Moonrise
7:07 PM
Moonset
10:42 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, 2 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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