National Weather Service Forecast for: Rapid Valley SD
Issued by: National Weather Service Rapid City, SD
Updated: 12:31 am MDT Aug 20, 2026
 
Overnight

Overnight: Mostly clear, with a low around 62. West wind around 7 mph, with gusts as high as 16 mph.
Mostly Clear

 Thursday

Thursday: Sunny, with a high near 93. Northwest wind 5 to 9 mph becoming northeast in the afternoon. Winds could gust as high as 21 mph.
Sunny

 Thursday
Night
Thursday Night: Patchy smoke between 9pm and 4am. Mostly clear, with a low around 62. Northeast wind 5 to 7 mph becoming light and variable in the evening. Winds could gust as high as 18 mph.
Patchy Smoke

 Friday

Friday: Mostly sunny, with a high near 93. Light and variable wind becoming northeast 6 to 11 mph in the morning. Winds could gust as high as 22 mph.
Mostly Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 60. Northeast wind 5 to 10 mph becoming light north after midnight. Winds could gust as high as 22 mph.
Mostly Clear

 Saturday

Saturday: Mostly sunny, with a high near 87. Light and variable wind becoming southeast 12 to 17 mph in the morning. Winds could gust as high as 31 mph.
Mostly Sunny

 Saturday
Night
Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 40%.
Chance
T-storms then
Chance
Showers
 Sunday

Sunday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 93.
Partly Sunny
then Slight
Chance
T-storms
 Sunday
Night
Sunday Night: A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 64.
Slight Chance
T-storms then
Partly Cloudy
Lo 62 °F Hi 93 °F Lo 62 °F Hi 93 °F Lo 60 °F Hi 87 °F Lo 63 °F Hi 93 °F Lo 64 °F

 

Overnight
 
 Mostly clear, with a low around 62. West wind around 7 mph, with gusts as high as 16 mph.
Thursday
 
 Sunny, with a high near 93. Northwest wind 5 to 9 mph becoming northeast in the afternoon. Winds could gust as high as 21 mph.
Thursday Night
 
 Patchy smoke between 9pm and 4am. Mostly clear, with a low around 62. Northeast wind 5 to 7 mph becoming light and variable in the evening. Winds could gust as high as 18 mph.
Friday
 
 Mostly sunny, with a high near 93. Light and variable wind becoming northeast 6 to 11 mph in the morning. Winds could gust as high as 22 mph.
Friday Night
 
 Mostly clear, with a low around 60. Northeast wind 5 to 10 mph becoming light north after midnight. Winds could gust as high as 22 mph.
Saturday
 
 Mostly sunny, with a high near 87. Light and variable wind becoming southeast 12 to 17 mph in the morning. Winds could gust as high as 31 mph.
Saturday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 40%.
Sunday
 
 A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 93.
Sunday Night
 
 A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 64.
Monday
 
 A slight chance of showers and thunderstorms after noon. Sunny, with a high near 91.
Monday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Tuesday
 
 A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Tuesday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Wednesday
 
 A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87.

 

Forecast from NOAA-NWS for Rapid Valley SD.