National Weather Service Forecast for: Spearfish 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. Southwest wind around 5 mph.
Mostly Clear

 Thursday

Thursday: Sunny, with a high near 90. Calm wind becoming north 5 to 7 mph in the morning. Winds could gust as high as 18 mph.
Sunny

 Thursday
Night
Thursday Night: Patchy smoke between 2am and 4am. Partly cloudy, with a low around 64. Southeast wind 5 to 8 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.
Mostly Clear
then Patchy
Smoke
 Friday

Friday: Mostly sunny, with a high near 91. Calm wind becoming north 5 to 9 mph in the afternoon. Winds could gust as high as 18 mph.
Mostly Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 61. Northeast wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 18 mph.
Mostly Clear

 Saturday

Saturday: Mostly sunny, with a high near 87. Light southeast wind increasing to 11 to 16 mph in the morning. Winds could gust as high as 28 mph.
Mostly Sunny

 Saturday
Night
Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 50%.
Chance
T-storms then
Chance
Showers
 Sunday

Sunday: Mostly sunny, with a high near 91.
Mostly Sunny

 Sunday
Night
Sunday Night: A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 65.
Chance
T-storms then
Partly Cloudy
Lo 62 °F Hi 90 °F Lo 64 °F Hi 91 °F Lo 61 °F Hi 87 °F Lo 65 °F Hi 91 °F Lo 65 °F

 

Overnight
 
 Mostly clear, with a low around 62. Southwest wind around 5 mph.
Thursday
 
 Sunny, with a high near 90. Calm wind becoming north 5 to 7 mph in the morning. Winds could gust as high as 18 mph.
Thursday Night
 
 Patchy smoke between 2am and 4am. Partly cloudy, with a low around 64. Southeast wind 5 to 8 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.
Friday
 
 Mostly sunny, with a high near 91. Calm wind becoming north 5 to 9 mph in the afternoon. Winds could gust as high as 18 mph.
Friday Night
 
 Mostly clear, with a low around 61. Northeast wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 18 mph.
Saturday
 
 Mostly sunny, with a high near 87. Light southeast wind increasing to 11 to 16 mph in the morning. Winds could gust as high as 28 mph.
Saturday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 50%.
Sunday
 
 Mostly sunny, with a high near 91.
Sunday Night
 
 A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 65.
Monday
 
 Sunny, with a high near 88.
Monday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 61.
Tuesday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Tuesday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 59.
Wednesday
 
 A slight chance of showers and thunderstorms. Mostly sunny, with a high near 86.

 

Forecast from NOAA-NWS for Spearfish SD.