National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Sisseton, Sisseton Municipal Airport (K8D3)

Lat: 45.67°NLon: 96.99°WElev: 1161ft.

69°F

21°C

Humidity 59%
Wind Speed SE 10 G 22 mph
Barometer 30.16 in (1020.7 mb)
Dewpoint 54°F (12°C)
Visibility NA
Last update 23 Sep 6:56 pm CDT
Extended Forecast for

Grenville SD

  • Tonight

    Tonight: Rain and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 57. Breezy, with a south wind 16 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 57 °F

    Chance
    Showers and
    Breezy then
    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before noon, then a slight chance of showers between noon and 1pm. Cloudy, with a high near 64. South wind 9 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 64 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Cloudy, with a low around 57. South southeast wind 6 to 8 mph.

    Low: 57 °F

    Cloudy

  • Friday

    Friday: A chance of showers after 1pm. Mostly cloudy, with a high near 64. Southeast wind 7 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    High: 64 °F

    Cloudy then
    Chance
    Showers

  • Friday Night

    Friday Night: Showers. Low around 57. Southeast wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 57 °F

    Showers
    Likely then
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 67. South southeast wind 9 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    High: 67 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 57. South southeast wind around 6 mph.

    Low: 57 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 68. West wind around 6 mph becoming east in the morning.

    High: 68 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 58. East southeast wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 58 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
Rain and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 57. Breezy, with a south wind 16 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Showers likely and possibly a thunderstorm before noon, then a slight chance of showers between noon and 1pm. Cloudy, with a high near 64. South wind 9 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Cloudy, with a low around 57. South southeast wind 6 to 8 mph.
Friday
A chance of showers after 1pm. Mostly cloudy, with a high near 64. Southeast wind 7 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Friday Night
Showers. Low around 57. Southeast wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 67. South southeast wind 9 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 57. South southeast wind around 6 mph.
Sunday
Partly sunny, with a high near 68. West wind around 6 mph becoming east in the morning.
Sunday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 58. East southeast wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Monday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
Monday Night
Showers and possibly a thunderstorm. Low around 53. Chance of precipitation is 80%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 59. Chance of precipitation is 40%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 47. Chance of precipitation is 30%.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 58. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grenville SD
 45.46°N 97.4°W (Elev. 1821 ft)
Last Update:
7:21 pm CDT Sep 23, 2026
Forecast Valid:
7pm CDT Sep 23, 2026-6pm CDT Sep 30, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation