National Weather Service Forecast for: Sioux Falls 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 52. North northwest wind around 5 mph becoming calm.
Mostly Clear

 Juneteenth

Juneteenth: A 40 percent chance of showers, mainly before 1pm. Partly sunny, with a high near 78. 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 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Partly Cloudy

 Saturday

Saturday: Increasing clouds, with a high near 79. Calm wind becoming east northeast around 5 mph in the afternoon.
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 70. East wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Showers
Likely

 Sunday
Night
Sunday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 53.
Chance
Showers

 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 55.
Mostly Cloudy
then Chance
Showers
Lo 52 °F Hi 78 °F Lo 52 °F Hi 79 °F Lo 57 °F Hi 70 °F Lo 53 °F Hi 73 °F Lo 55 °F

 

Tonight
 
 Mostly clear, with a low around 52. North northwest wind around 5 mph becoming calm.
Juneteenth
 
 A 40 percent chance of showers, mainly before 1pm. Partly sunny, with a high near 78. 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 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Saturday
 
 Increasing clouds, with a high near 79. Calm wind becoming east northeast around 5 mph in the afternoon.
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 70. East wind around 15 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 53.
Monday
 
 Partly sunny, with a high near 73.
Monday Night
 
 A 30 percent chance of showers after 1am. 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 77.
Wednesday Night
 
 Mostly clear, with a low around 54.
Thursday
 
 Mostly sunny, with a high near 78.

 

Forecast from NOAA-NWS for Sioux Falls SD.