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

Overnight: Patchy dense fog. Otherwise, mostly clear, with a low around 59. South wind around 5 mph.
Patchy Dense
Fog

 Thursday

Thursday: A slight chance of showers and thunderstorms between 4pm and 5pm. Areas of dense fog before 8am. Otherwise, sunny, with a high near 83. South southwest wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Areas Dense
Fog then
Slight Chance
T-storms
 Thursday
Night
Thursday Night: A 20 percent chance of showers and thunderstorms before 10pm. Mostly clear, with a low around 62. South wind 5 to 10 mph.
Slight Chance
T-storms then
Mostly Clear
 Friday

Friday: Sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.
Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 61. East northeast wind around 5 mph.
Mostly Clear

 Saturday

Saturday: Sunny, with a high near 81. North northeast wind around 5 mph.
Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 58.
Partly Cloudy

 Sunday

Sunday: Partly sunny, with a high near 77.
Partly Sunny

 Sunday
Night
Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
Lo 59 °F Hi 83 °F Lo 62 °F Hi 84 °F Lo 61 °F Hi 81 °F Lo 58 °F Hi 77 °F Lo 61 °F

Hazardous Weather Outlook
Dense Fog Advisory
 

Overnight
 
 Patchy dense fog. Otherwise, mostly clear, with a low around 59. South wind around 5 mph.
Thursday
 
 A slight chance of showers and thunderstorms between 4pm and 5pm. Areas of dense fog before 8am. Otherwise, sunny, with a high near 83. South southwest wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Thursday Night
 
 A 20 percent chance of showers and thunderstorms before 10pm. Mostly clear, with a low around 62. South wind 5 to 10 mph.
Friday
 
 Sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.
Friday Night
 
 Mostly clear, with a low around 61. East northeast wind around 5 mph.
Saturday
 
 Sunny, with a high near 81. North northeast wind around 5 mph.
Saturday Night
 
 Partly cloudy, with a low around 58.
Sunday
 
 Partly sunny, with a high near 77.
Sunday Night
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Monday
 
 Partly sunny, with a high near 80.
Monday Night
 
 Partly cloudy, with a low around 63.
Tuesday
 
 Mostly sunny, with a high near 83.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 61.
Wednesday
 
 Mostly sunny, with a high near 81.

 

Forecast from NOAA-NWS for Vermillion SD.