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

Tonight: Partly cloudy, with a low around 49. North northwest wind around 5 mph becoming calm.
Partly Cloudy

 Juneteenth

Juneteenth: A 40 percent chance of showers, mainly before noon. Mostly cloudy, then gradually becoming sunny, with a high near 76. Breezy, with a south wind 5 to 10 mph becoming west 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Chance
Showers and
Breezy
 Friday
Night
Friday Night: Mostly clear, with a low around 49. North wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.
Mostly Clear

 Saturday

Saturday: Mostly sunny, with a high near 77. Calm wind becoming east northeast around 5 mph in the afternoon.
Mostly Sunny

 Saturday
Night
Saturday Night: A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 55. East wind 10 to 15 mph, with gusts as high as 20 mph.
Chance
Showers
 Sunday

Sunday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 69. Breezy, with an east wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
Chance
Showers and
Breezy
 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 51.
Mostly Cloudy

 Monday

Monday: Partly sunny, with a high near 73.
Partly Sunny

 Monday
Night
Monday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 53.
Mostly Cloudy
then Chance
Showers
Lo 49 °F Hi 76 °F Lo 49 °F Hi 77 °F Lo 55 °F Hi 69 °F Lo 51 °F Hi 73 °F Lo 53 °F

 

Tonight
 
 Partly cloudy, with a low around 49. North northwest wind around 5 mph becoming calm.
Juneteenth
 
 A 40 percent chance of showers, mainly before noon. Mostly cloudy, then gradually becoming sunny, with a high near 76. Breezy, with a south wind 5 to 10 mph becoming west 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Friday Night
 
 Mostly clear, with a low around 49. North wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.
Saturday
 
 Mostly sunny, with a high near 77. Calm wind becoming east northeast around 5 mph in the afternoon.
Saturday Night
 
 A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 55. East wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
 
 A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 69. Breezy, with an east wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
Sunday Night
 
 Mostly cloudy, with a low around 51.
Monday
 
 Partly sunny, with a high near 73.
Monday Night
 
 A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 53.
Tuesday
 
 A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 74. Chance of precipitation is 40%.
Tuesday Night
 
 Partly cloudy, with a low around 52.
Wednesday
 
 Mostly sunny, with a high near 76.
Wednesday Night
 
 Mostly clear, with a low around 52.
Thursday
 
 Mostly sunny, with a high near 77.

 

Forecast from NOAA-NWS for Flandreau SD.