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

Heavy Rainfall in the East Wednesday; Hot Temperatures Continue in Coastal Southern California

Heavy to excessive rainfall may lead to flooding Wednesday over southwest Pennsylvania into northern West Virginia, and western Maryland. Flood Watches have been issued. An extended period of hot weather will continue for parts of coastal southern California including Los Angeles through Thursday. Heat Advisories remain in effect. Read More >

Current conditions at

Sisseton, Sisseton Municipal Airport (K8D3)

Lat: 45.67°NLon: 96.99°WElev: 1161ft.

39°F

4°C

Humidity 100%
Wind Speed NE 12 mph
Barometer 29.79 in (1009.7 mb)
Dewpoint 39°F (4°C)
Visibility NA
Wind Chill32°F (0°C)
Last update 20 May 11:56 pm CDT
Extended Forecast for

Grenville SD

  • Overnight

    Overnight: Rain likely before 3am, then a chance of rain and snow between 3am and 4am, then a chance of rain after 4am. Cloudy, with a low around 35. North northwest wind 8 to 10 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 35 °F

    Rain/Snow
    Likely

  • Wednesday

    Wednesday: A chance of rain and snow before 10am, then rain likely. Cloudy, with a high near 44. North northwest wind 9 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    High: 44 °F

    Chance
    Rain/Snow
    then Rain
    Likely

  • Wednesday Night

    Wednesday Night: A chance of rain before 1am. Cloudy, with a steady temperature around 43. North wind 6 to 11 mph. Chance of precipitation is 50%.

    Low: 43 °F

    Chance Rain

  • Thursday

    Thursday: Cloudy, then gradually becoming mostly sunny, with a high near 58. North wind 7 to 9 mph.

    High: 58 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 41. North northeast wind 5 to 8 mph becoming light and variable in the evening.

    Low: 41 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers after 1pm. Mostly cloudy, with a high near 58. Southeast wind 5 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

    High: 58 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers. Mostly cloudy, with a low around 45. East southeast wind around 10 mph. Chance of precipitation is 30%.

    Low: 45 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of showers. Mostly cloudy, with a high near 58. East southeast wind 9 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 30%.

    High: 58 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers. Mostly cloudy, with a low around 46. East wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 46 °F

    Chance
    Showers

Detailed Forecast

Overnight
Rain likely before 3am, then a chance of rain and snow between 3am and 4am, then a chance of rain after 4am. Cloudy, with a low around 35. North northwest wind 8 to 10 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Wednesday
A chance of rain and snow before 10am, then rain likely. Cloudy, with a high near 44. North northwest wind 9 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Wednesday Night
A chance of rain before 1am. Cloudy, with a steady temperature around 43. North wind 6 to 11 mph. Chance of precipitation is 50%.
Thursday
Cloudy, then gradually becoming mostly sunny, with a high near 58. North wind 7 to 9 mph.
Thursday Night
Partly cloudy, with a low around 41. North northeast wind 5 to 8 mph becoming light and variable in the evening.
Friday
A chance of showers after 1pm. Mostly cloudy, with a high near 58. Southeast wind 5 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 45. East southeast wind around 10 mph. Chance of precipitation is 30%.
Saturday
A chance of showers. Mostly cloudy, with a high near 58. East southeast wind 9 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 30%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 46. East wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Sunday
A chance of showers. Mostly cloudy, with a high near 59. Chance of precipitation is 40%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 46. Chance of precipitation is 30%.
Memorial Day
A chance of showers. Mostly sunny, with a high near 63. Chance of precipitation is 30%.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 46. Chance of precipitation is 20%.
Tuesday
A slight chance of showers. Sunny, with a high near 68. 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 97.37°W (Elev. 1795 ft)
Last Update:
11:44 pm CDT May 20, 2025
Forecast Valid:
12am CDT May 21, 2025-6pm CDT May 27, 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