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

Extreme Heat and Excessive Rainfall Today

Dangerous and extreme heat will remain across portions of the southern U.S. through the weekend. A heat wave over the Southwest U.S. will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Multiple rounds of thunderstorms will produce heavy to excessive rainfall with significant flash flooding across portions of southern New England. Read More >

Current conditions at

Rapid City, Rapid City Regional Airport (KRAP)

Lat: 44.05°NLon: 103.05°WElev: 3202ft.

Partly Cloudy

95°F

35°C

Humidity 28%
Wind Speed SE 10 mph
Barometer 29.85 in (1007.3 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 29 Jul 5:52 pm MDT
Extended Forecast for

5 Miles NNE Keystone SD

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly before 3am. Mostly cloudy, with a low around 64. South wind around 6 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.

    Low: 64 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly after noon. Cloudy, then gradually becoming mostly sunny, with a high near 83. Light north wind increasing to 5 to 9 mph in the morning. Winds could gust as high as 26 mph. Chance of precipitation is 70%.

    High: 83 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming clear, with a low around 58. North wind 5 to 9 mph becoming light and variable after midnight. Winds could gust as high as 26 mph.

    Low: 58 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 85. Light and variable wind becoming southeast around 6 mph in the morning. Winds could gust as high as 20 mph.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. Southeast wind around 6 mph becoming west after midnight. Winds could gust as high as 17 mph.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 91. West wind 5 to 9 mph becoming southeast in the morning. Winds could gust as high as 25 mph.

    High: 91 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 100.

    High: 100 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Tonight
A 50 percent chance of showers and thunderstorms, mainly before 3am. Mostly cloudy, with a low around 64. South wind around 6 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Thursday
Showers and thunderstorms likely, mainly after noon. Cloudy, then gradually becoming mostly sunny, with a high near 83. Light north wind increasing to 5 to 9 mph in the morning. Winds could gust as high as 26 mph. Chance of precipitation is 70%.
Thursday Night
Mostly cloudy, then gradually becoming clear, with a low around 58. North wind 5 to 9 mph becoming light and variable after midnight. Winds could gust as high as 26 mph.
Friday
Sunny, with a high near 85. Light and variable wind becoming southeast around 6 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
Partly cloudy, with a low around 61. Southeast wind around 6 mph becoming west after midnight. Winds could gust as high as 17 mph.
Saturday
Sunny, with a high near 91. West wind 5 to 9 mph becoming southeast in the morning. Winds could gust as high as 25 mph.
Saturday Night
Mostly clear, with a low around 68.
Sunday
Sunny and hot, with a high near 100.
Sunday Night
Mostly clear, with a low around 68.
Monday
Sunny, with a high near 84.
Monday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 55.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 54.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NNE Keystone SD
 43.96°N 103.41°W (Elev. 4928 ft)
Last Update:
4:47 pm MDT Jul 29, 2026
Forecast Valid:
6pm MDT Jul 29, 2026-6pm MDT Aug 5, 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