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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

Sisseton, Sisseton Municipal Airport (K8D3)

Lat: 45.67°NLon: 96.99°WElev: 1161ft.

28°F

-2°C

Humidity 88%
Wind Speed N 17 mph
Barometer 30.10 in (1021.8 mb)
Dewpoint 25°F (-4°C)
Visibility NA
Wind Chill16°F (-9°C)
Last update 24 Dec 3:56 pm CST
Extended Forecast for

Grenville SD

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 38. North northeast wind around 13 mph.

    High: 38 °F

    Partly Sunny

  • Tonight

    Tonight: Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 21. Northeast wind 10 to 14 mph becoming east southeast after midnight.

    Low: 21 °F

    Patchy Fog

  • Christmas Day

    Christmas Day: A slight chance of freezing rain between 10am and 11am. Areas of fog between 1pm and 3pm. Areas of freezing fog between noon and 1pm. Otherwise, mostly cloudy, with a high near 37. East southeast wind 14 to 17 mph becoming south in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 10%.

    High: 37 °F

    Slight Chance
    Freezing Rain
    and Areas
    Freezing Fog

  • Thursday Night

    Thursday Night: A slight chance of rain after midnight, mixing with freezing rain after 3am. Mostly cloudy, with a low around 28. South wind 8 to 13 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 20%.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Freezing
    Rain

  • Friday

    Friday: Partly sunny, with a high near 34. Northwest wind 6 to 9 mph becoming south in the afternoon.

    High: 34 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 31. South wind 8 to 11 mph.

    Low: 31 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 41. South southwest wind 10 to 13 mph becoming northwest in the afternoon.

    High: 41 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A slight chance of snow after midnight. Mostly cloudy, with a low around 8. Blustery, with a northwest wind 14 to 19 mph increasing to 20 to 25 mph after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 20%.

    Low: 8 °F

    Blustery.
    Partly Cloudy
    then Slight
    Chance Snow

  • Sunday

    Sunday: A slight chance of snow before noon. Partly sunny, with a high near 12. Blustery, with a northwest wind 24 to 26 mph, with gusts as high as 41 mph. Chance of precipitation is 20%.

    High: 12 °F

    Blustery.
    Slight Chance
    Snow then
    Partly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 38. North northeast wind around 13 mph.
Tonight
Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 21. Northeast wind 10 to 14 mph becoming east southeast after midnight.
Christmas Day
A slight chance of freezing rain between 10am and 11am. Areas of fog between 1pm and 3pm. Areas of freezing fog between noon and 1pm. Otherwise, mostly cloudy, with a high near 37. East southeast wind 14 to 17 mph becoming south in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 10%.
Thursday Night
A slight chance of rain after midnight, mixing with freezing rain after 3am. Mostly cloudy, with a low around 28. South wind 8 to 13 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 20%.
Friday
Partly sunny, with a high near 34. Northwest wind 6 to 9 mph becoming south in the afternoon.
Friday Night
Partly cloudy, with a low around 31. South wind 8 to 11 mph.
Saturday
Mostly sunny, with a high near 41. South southwest wind 10 to 13 mph becoming northwest in the afternoon.
Saturday Night
A slight chance of snow after midnight. Mostly cloudy, with a low around 8. Blustery, with a northwest wind 14 to 19 mph increasing to 20 to 25 mph after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 20%.
Sunday
A slight chance of snow before noon. Partly sunny, with a high near 12. Blustery, with a northwest wind 24 to 26 mph, with gusts as high as 41 mph. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 0. Blustery.
Monday
Mostly sunny, with a high near 16.
Monday Night
Mostly cloudy, with a low around 8.
Tuesday
Mostly cloudy, with a high near 30.
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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:
3:36 pm CST Dec 24, 2025
Forecast Valid:
4pm CST Dec 24, 2025-6pm CST Dec 30, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

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Chance of Precipitation