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

Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring moderate to locally heavy rain to portions of South Texas into Saturday. Read More >

Hazardous Weather Conditions

Current conditions at

Rapid City, Rapid City Regional Airport (KRAP)

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

Fair

69°F

21°C

Humidity 76%
Wind Speed N 12 mph
Barometer 29.99 in (1012.8 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 15 Aug 8:52 am MDT
Extended Forecast for

Rapid Valley SD

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 87. East wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 87 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 3am. Mostly cloudy, with a low around 65. East wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.

    Low: 65 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms, mainly after noon. Partly sunny, with a high near 83. South wind 5 to 10 mph becoming east in the morning. Winds could gust as high as 20 mph.

    High: 83 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 63. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 87. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 87 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 62. East wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.

    Low: 62 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 87. West wind 5 to 10 mph becoming east in the morning. Winds could gust as high as 20 mph.

    High: 87 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before midnight. Mostly clear, with a low around 63. East wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.

    Low: 63 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 87. East wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 3am. Mostly cloudy, with a low around 65. East wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Saturday
A 40 percent chance of showers and thunderstorms, mainly after noon. Partly sunny, with a high near 83. South wind 5 to 10 mph becoming east in the morning. Winds could gust as high as 20 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 63. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 87. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 62. East wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.
Monday
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 87. West wind 5 to 10 mph becoming east in the morning. Winds could gust as high as 20 mph.
Monday Night
A slight chance of showers and thunderstorms before midnight. Mostly clear, with a low around 63. East wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.
Tuesday
Sunny, with a high near 90.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Mostly clear, with a low around 65.
Thursday
Sunny, with a high near 92.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rapid Valley SD
 44.08°N 103.15°W (Elev. 3271 ft)
Last Update:
9:29 am MDT Aug 15, 2025
Forecast Valid:
9am MDT Aug 15, 2025-6pm MDT Aug 21, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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