National Weather Service Forecast for: Madison SD
Issued by: National Weather Service Sioux Falls, SD
Updated: 2:39 am CDT Aug 20, 2026
 
Overnight

Overnight: Mostly clear, with a low around 59. South southwest wind around 10 mph.
Mostly Clear

 Thursday

Thursday: A slight chance of rain before 1pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 83. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 10%.
Mostly Sunny
then Slight
Chance
T-storms
 Thursday
Night
Thursday Night: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 8pm. Mostly clear, with a low around 59. West wind 5 to 10 mph. Chance of precipitation is 20%.
Slight Chance
T-storms then
Mostly Clear
 Friday

Friday: Sunny, with a high near 81. North wind 5 to 10 mph.
Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 58. Northeast wind around 5 mph.
Mostly Clear

 Saturday

Saturday: Sunny, with a high near 79. North northeast wind 5 to 10 mph.
Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 55.
Partly Cloudy

 Sunday

Sunday: Partly sunny, with a high near 78.
Partly Sunny

 Sunday
Night
Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Chance
T-storms
Lo 59 °F Hi 83 °F Lo 59 °F Hi 81 °F Lo 58 °F Hi 79 °F Lo 55 °F Hi 78 °F Lo 60 °F

Hazardous Weather Outlook
 

Overnight
 
 Mostly clear, with a low around 59. South southwest wind around 10 mph.
Thursday
 
 A slight chance of rain before 1pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 83. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 10%.
Thursday Night
 
 A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 8pm. Mostly clear, with a low around 59. West wind 5 to 10 mph. Chance of precipitation is 20%.
Friday
 
 Sunny, with a high near 81. North wind 5 to 10 mph.
Friday Night
 
 Mostly clear, with a low around 58. Northeast wind around 5 mph.
Saturday
 
 Sunny, with a high near 79. North northeast wind 5 to 10 mph.
Saturday Night
 
 Partly cloudy, with a low around 55.
Sunday
 
 Partly sunny, with a high near 78.
Sunday Night
 
 A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Monday
 
 Partly sunny, with a high near 80.
Monday Night
 
 Partly cloudy, with a low around 62.
Tuesday
 
 Mostly sunny, with a high near 81.
Tuesday Night
 
 Partly cloudy, with a low around 59.
Wednesday
 
 Mostly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Madison SD.