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

Thunderstorms and Heavy Rains Across Portions of the Central and Eastern US; Heat Expands to Portions of the East

Widespread showers and thunderstorms, some severe, may produce heavy downpours and flash flooding across much of the eastern and central U.S. Dangerous heat will continue in the Pacific Northwest and expand across portions of the East. Deep tropical moisture and associated thunderstorms will bring heavy rainfall and localized flash flooding across portions of Florida into the central Gulf Coast. Read More >

Hazardous Weather Conditions

Current conditions at

Sisseton, Sisseton Municipal Airport (K8D3)

Lat: 45.67°NLon: 96.99°WElev: 1161ft.

61°F

16°C

Humidity 97%
Wind Speed N 12 mph
Barometer 29.98 in (1014.0 mb)
Dewpoint 60°F (16°C)
Visibility NA
Last update 16 Jul 12:56 am CDT
Extended Forecast for

Grenville SD

  • Overnight

    Overnight: A slight chance of showers after 4am. Areas of smoke before 4am. Cloudy, with a low around 55. North northeast wind around 18 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.

    Low: 55 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Showers and thunderstorms likely before 4pm, then a chance of showers. Cloudy, with a high near 62. North northeast wind around 17 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 62 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A slight chance of showers before 7pm. Partly cloudy, with a low around 50. North wind 7 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 10%.

    Low: 50 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 69. North northeast wind 6 to 8 mph becoming southeast in the afternoon.

    High: 69 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 57. Southeast wind around 10 mph.

    Low: 57 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 72. South southeast wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.

    High: 72 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 61. South wind 7 to 10 mph becoming north after midnight. Chance of precipitation is 40%.

    Low: 61 °F

    Chance
    T-storms

  • Saturday

    Saturday: Partly sunny, with a high near 75. North northeast wind around 9 mph.

    High: 75 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 59. Northeast wind 6 to 9 mph.

    Low: 59 °F

    Partly Cloudy

Detailed Forecast

Overnight
A slight chance of showers after 4am. Areas of smoke before 4am. Cloudy, with a low around 55. North northeast wind around 18 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.
Wednesday
Showers and thunderstorms likely before 4pm, then a chance of showers. Cloudy, with a high near 62. North northeast wind around 17 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A slight chance of showers before 7pm. Partly cloudy, with a low around 50. North wind 7 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 10%.
Thursday
Sunny, with a high near 69. North northeast wind 6 to 8 mph becoming southeast in the afternoon.
Thursday Night
Mostly cloudy, with a low around 57. Southeast wind around 10 mph.
Friday
A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 72. South southeast wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 61. South wind 7 to 10 mph becoming north after midnight. Chance of precipitation is 40%.
Saturday
Partly sunny, with a high near 75. North northeast wind around 9 mph.
Saturday Night
Partly cloudy, with a low around 59. Northeast wind 6 to 9 mph.
Sunday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 76. Chance of precipitation is 20%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 40%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 80. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 64. Chance of precipitation is 40%.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 81. 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:
12:47 am CDT Jul 16, 2025
Forecast Valid:
1am CDT Jul 16, 2025-6pm CDT Jul 22, 2025
 
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