National Weather Service Forecast for: Fort Pierre SD
Issued by: National Weather Service Aberdeen, SD
Updated: 9:36 pm CDT Jun 18, 2026
 
Tonight

Tonight: A slight chance of thunderstorms after 5am. Partly cloudy, with a low around 52. Calm wind becoming west around 5 mph after midnight. Chance of precipitation is 10%.
Partly Cloudy
then Slight
Chance
T-storms
 Juneteenth

Juneteenth: A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 10am. Mostly cloudy, then gradually becoming sunny, with a high near 80. Northwest wind 6 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Slight Chance
T-storms then
Mostly Sunny
 Friday
Night
Friday Night: Partly cloudy, with a low around 49. North northwest wind 8 to 13 mph becoming light and variable after midnight.
Partly Cloudy

 Saturday

Saturday: A chance of showers after 1pm. Partly sunny, with a high near 78. East southeast wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 30%.
Mostly Sunny
then Chance
Showers
 Saturday
Night
Saturday Night: Showers and possibly a thunderstorm. Low around 52. East wind 11 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Showers

 Sunday

Sunday: Showers and possibly a thunderstorm. High near 67. East wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Showers

 Sunday
Night
Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 49. East northeast wind 8 to 13 mph becoming light northeast after midnight. Chance of precipitation is 50%.
Chance
Showers

 Monday

Monday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 73. North northeast wind 5 to 9 mph becoming east southeast in the afternoon. Chance of precipitation is 30%.
Chance
Showers

 Monday
Night
Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. East southeast wind 5 to 8 mph becoming west after midnight. Chance of precipitation is 50%.
Chance
T-storms
Lo 52 °F Hi 80 °F Lo 49 °F Hi 78 °F Lo 52 °F Hi 67 °F Lo 49 °F Hi 73 °F Lo 51 °F

 

Tonight
 
 A slight chance of thunderstorms after 5am. Partly cloudy, with a low around 52. Calm wind becoming west around 5 mph after midnight. Chance of precipitation is 10%.
Juneteenth
 
 A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 10am. Mostly cloudy, then gradually becoming sunny, with a high near 80. Northwest wind 6 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Friday Night
 
 Partly cloudy, with a low around 49. North northwest wind 8 to 13 mph becoming light and variable after midnight.
Saturday
 
 A chance of showers after 1pm. Partly sunny, with a high near 78. East southeast wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 30%.
Saturday Night
 
 Showers and possibly a thunderstorm. Low around 52. East wind 11 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
 
 Showers and possibly a thunderstorm. High near 67. East wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 49. East northeast wind 8 to 13 mph becoming light northeast after midnight. Chance of precipitation is 50%.
Monday
 
 A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 73. North northeast wind 5 to 9 mph becoming east southeast in the afternoon. Chance of precipitation is 30%.
Monday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. East southeast wind 5 to 8 mph becoming west after midnight. Chance of precipitation is 50%.
Tuesday
 
 A slight chance of showers before 1pm. Mostly sunny, with a high near 76. Chance of precipitation is 20%.
Tuesday Night
 
 Mostly clear, with a low around 49.
Wednesday
 
 Sunny, with a high near 78.
Wednesday Night
 
 A slight chance of showers and thunderstorms. Partly cloudy, with a low around 51. Chance of precipitation is 20%.
Thursday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 79. Chance of precipitation is 30%.

 

Forecast from NOAA-NWS for Fort Pierre SD.