National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms; Excessive Rainfall; Dangerous Heat; Air Quality Concerns and the Tropics

Wildfire smoke will push into the Midwest, worsening air quality. A frontal system brings severe storms from the Northern Plains to the Mid‑Atlantic the next few days. Heavy Gulf Coast rain is possible as Tropical Depression Two has formed, while monsoonal storms persist in the Southwest with heavy rainfall. Hazardous heat expands from the Plains into the Lower Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Spearfish / Clyde Ice (KSPF)

Lat: 44.48°NLon: 103.78°WElev: 3898ft.

Fair

97°F

36°C

Humidity 22%
Wind Speed NE 6 mph
Barometer 29.95 in
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 19 Jul 6:35 pm MDT
Extended Forecast for

Spearfish SD

Heat Advisory July 19, 06:45pm until July 19, 09:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory July 19, 06:45pm until July 19, 09:00pm

    NOW until 9:00pm Sun

    Heat Advisory

  • Tonight

    Low: 70 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Areas of smoke. Sunny, with a high near 94. Light and variable wind becoming north 8 to 13 mph in the morning. Winds could gust as high as 21 mph.

    High: 94 °F

    Areas Smoke

  • Monday Night

    Monday Night: Areas of smoke. Partly cloudy, with a low around 65. North wind 9 to 14 mph becoming light in the evening. Winds could gust as high as 21 mph.

    Low: 65 °F

    Areas Smoke

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84. Light and variable wind becoming east 8 to 13 mph in the morning. Winds could gust as high as 22 mph.

    High: 84 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm after midnight. Increasing clouds, with a low around 64. Southeast wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    Low: 64 °F

    Mostly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 9am, then a chance of showers between 9am and noon, then a chance of showers and thunderstorms after noon. Cloudy, then gradually becoming mostly sunny, with a high near 86. East wind 7 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 84.

    High: 84 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms between 8pm and 10pm. Partly cloudy, with a low around 70. Northeast wind around 6 mph becoming calm in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 20%.
Monday
Areas of smoke. Sunny, with a high near 94. Light and variable wind becoming north 8 to 13 mph in the morning. Winds could gust as high as 21 mph.
Monday Night
Areas of smoke. Partly cloudy, with a low around 65. North wind 9 to 14 mph becoming light in the evening. Winds could gust as high as 21 mph.
Tuesday
Mostly sunny, with a high near 84. Light and variable wind becoming east 8 to 13 mph in the morning. Winds could gust as high as 22 mph.
Tuesday Night
Showers likely and possibly a thunderstorm after midnight. Increasing clouds, with a low around 64. Southeast wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Wednesday
A chance of showers and thunderstorms before 9am, then a chance of showers between 9am and noon, then a chance of showers and thunderstorms after noon. Cloudy, then gradually becoming mostly sunny, with a high near 86. East wind 7 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Thursday
A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 84.
Thursday Night
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 63.
Friday
Sunny, with a high near 91.
Friday Night
Mostly clear, with a low around 70.
Saturday
Sunny, with a high near 97.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 97.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Spearfish SD
 44.5°N 103.85°W (Elev. 3911 ft)
Last Update:
5:33 pm MDT Jul 19, 2026
Forecast Valid:
6pm MDT Jul 19, 2026-6pm MDT Jul 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation