National Weather Service Forecast for: Harrisburg SD
Issued by: National Weather Service Sioux Falls, SD
Updated: 7:28 pm CDT Jun 18, 2026
 
Tonight

Tonight: Mostly clear, with a low around 51. North northwest wind around 5 mph becoming calm.
Mostly Clear

 Juneteenth

Juneteenth: A 30 percent chance of showers, mainly before 2pm. Partly sunny, with a high near 79. Light and variable wind becoming west 10 to 15 mph in the morning. Winds could gust as high as 25 mph.
Chance
Showers

 Friday
Night
Friday Night: Partly cloudy, with a low around 52. Northwest wind 10 to 15 mph becoming north northeast 5 to 10 mph after midnight. Winds could gust as high as 20 mph.
Partly Cloudy

 Saturday

Saturday: Increasing clouds, with a high near 80. Calm wind becoming east around 5 mph in the morning.
Increasing
Clouds

 Saturday
Night
Saturday Night: Showers likely, mainly after 1am. Cloudy, with a low around 57. East wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Chance
Showers then
Showers
Likely
 Sunday

Sunday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 71. Breezy, with an east wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Showers
Likely and
Breezy
 Sunday
Night
Sunday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 54.
Chance
Showers

 Monday

Monday: Partly sunny, with a high near 74.
Partly Sunny

 Monday
Night
Monday Night: Mostly cloudy, with a low around 55.
Mostly Cloudy
Lo 51 °F Hi 79 °F Lo 52 °F Hi 80 °F Lo 57 °F Hi 71 °F Lo 54 °F Hi 74 °F Lo 55 °F

 

Tonight
 
 Mostly clear, with a low around 51. North northwest wind around 5 mph becoming calm.
Juneteenth
 
 A 30 percent chance of showers, mainly before 2pm. Partly sunny, with a high near 79. Light and variable wind becoming west 10 to 15 mph in the morning. Winds could gust as high as 25 mph.
Friday Night
 
 Partly cloudy, with a low around 52. Northwest wind 10 to 15 mph becoming north northeast 5 to 10 mph after midnight. Winds could gust as high as 20 mph.
Saturday
 
 Increasing clouds, with a high near 80. Calm wind becoming east around 5 mph in the morning.
Saturday Night
 
 Showers likely, mainly after 1am. Cloudy, with a low around 57. East wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Sunday
 
 Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 71. Breezy, with an east wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Sunday Night
 
 A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 54.
Monday
 
 Partly sunny, with a high near 74.
Monday Night
 
 Mostly cloudy, with a low around 55.
Tuesday
 
 A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 30%.
Tuesday Night
 
 Mostly clear, with a low around 54.
Wednesday
 
 Mostly sunny, with a high near 79.
Wednesday Night
 
 Mostly clear, with a low around 54.
Thursday
 
 Mostly sunny, with a high near 79.

 

Forecast from NOAA-NWS for Harrisburg SD.