National Weather Service Forecast for: Flandreau SD
Issued by: National Weather Service Sioux Falls, SD
Updated: 1:53 am CDT Jun 30, 2026
 
Overnight

Overnight: A 30 percent chance of showers, mainly before 4am. Mostly cloudy, with a low around 65. South wind around 5 mph.
Chance
Showers

 Tuesday

Tuesday: Sunny, with a high near 88. West southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Sunny

 Tuesday
Night
Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly after 3am. Increasing clouds, with a low around 64. West southwest wind around 5 mph becoming calm.
Mostly Clear
then Chance
T-storms
 Wednesday

Wednesday: Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 86. Southwest wind around 10 mph. Chance of precipitation is 70%.
Showers
Likely

 Wednesday
Night
Wednesday Night: A 10 percent chance of showers before 7pm. Partly cloudy, with a low around 63. West northwest wind around 5 mph becoming calm in the evening.
Slight Chance
Showers then
Partly Cloudy
 Thursday

Thursday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 90. Light east southeast wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Mostly Sunny
then Chance
T-storms
 Thursday
Night
Thursday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Low around 67. Chance of precipitation is 80%.
Showers

 Friday

Friday: Mostly sunny, with a high near 89.
Mostly Sunny

 Friday
Night
Friday Night: A chance of showers and thunderstorms, then showers likely after 1am. Partly cloudy, with a low around 68. Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
Lo 65 °F Hi 88 °F Lo 64 °F Hi 86 °F Lo 63 °F Hi 90 °F Lo 67 °F Hi 89 °F Lo 68 °F

Hazardous Weather Outlook
 

Overnight
 
 A 30 percent chance of showers, mainly before 4am. Mostly cloudy, with a low around 65. South wind around 5 mph.
Tuesday
 
 Sunny, with a high near 88. West southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
 
 A 50 percent chance of showers and thunderstorms, mainly after 3am. Increasing clouds, with a low around 64. West southwest wind around 5 mph becoming calm.
Wednesday
 
 Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 86. Southwest wind around 10 mph. Chance of precipitation is 70%.
Wednesday Night
 
 A 10 percent chance of showers before 7pm. Partly cloudy, with a low around 63. West northwest wind around 5 mph becoming calm in the evening.
Thursday
 
 A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 90. Light east southeast wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Thursday Night
 
 Showers and possibly a thunderstorm before 1am, then showers likely. Low around 67. Chance of precipitation is 80%.
Friday
 
 Mostly sunny, with a high near 89.
Friday Night
 
 A chance of showers and thunderstorms, then showers likely after 1am. Partly cloudy, with a low around 68. Chance of precipitation is 60%.
Independence Day
 
 A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87.
Saturday Night
 
 Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Sunday
 
 Partly sunny, with a high near 84.
Sunday Night
 
 Partly cloudy, with a low around 63.
Monday
 
 Mostly sunny, with a high near 86.

 

Forecast from NOAA-NWS for Flandreau SD.