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

Heavy to Excessive Rainfall for the Southwest U.S.; Watching for Possible East Coast Storm

Thunderstorms and a chance for some isolated flash flooding will continue today in the Southwest U.S. before an influx of tropical moisture from Priscilla brings widespread heavy rainfall and a flash flooding threat late this week into this weekend. A coastal storm may develop off the southeast U.S. coast Friday night and drift north just off the Mid-Atlantic coast through the weekend. Read More >

Hazardous Weather Conditions

Current conditions at

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Overcast

67°F

19°C

Humidity 44%
Wind Speed S 15 mph
Barometer 30.13 in
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 8 Oct 6:35 pm CDT
Extended Forecast for

Stephan SD

  • Tonight

    Tonight: Mostly clear, with a low around 51. Breezy, with a south wind 15 to 22 mph, with gusts as high as 34 mph.

    Low: 51 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Thursday

    Thursday: Sunny, with a high near 77. South wind 11 to 17 mph becoming west in the afternoon. Winds could gust as high as 28 mph.

    High: 77 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 47. North wind 7 to 9 mph.

    Low: 47 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 69. East northeast wind 7 to 11 mph.

    High: 69 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 47. East wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 47 °F

    Mostly Cloudy

  • Saturday

    Saturday: A slight chance of showers before 1pm. Partly sunny, with a high near 68. Breezy, with a southeast wind 17 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 20%.

    High: 68 °F

    Slight Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: A slight chance of showers after 1am. Mostly cloudy, with a low around 56. Southeast wind around 18 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.

    Low: 56 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers before 1pm. Mostly sunny, with a high near 78. Breezy, with a southeast wind 17 to 22 mph becoming west in the afternoon. Chance of precipitation is 20%.

    High: 78 °F

    Slight Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: A slight chance of showers before 1am. Partly cloudy, with a low around 42. Northwest wind 11 to 18 mph. Chance of precipitation is 20%.

    Low: 42 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 51. Breezy, with a south wind 15 to 22 mph, with gusts as high as 34 mph.
Thursday
Sunny, with a high near 77. South wind 11 to 17 mph becoming west in the afternoon. Winds could gust as high as 28 mph.
Thursday Night
Mostly clear, with a low around 47. North wind 7 to 9 mph.
Friday
Sunny, with a high near 69. East northeast wind 7 to 11 mph.
Friday Night
Mostly cloudy, with a low around 47. East wind 10 to 14 mph, with gusts as high as 23 mph.
Saturday
A slight chance of showers before 1pm. Partly sunny, with a high near 68. Breezy, with a southeast wind 17 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 20%.
Saturday Night
A slight chance of showers after 1am. Mostly cloudy, with a low around 56. Southeast wind around 18 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.
Sunday
A slight chance of showers before 1pm. Mostly sunny, with a high near 78. Breezy, with a southeast wind 17 to 22 mph becoming west in the afternoon. Chance of precipitation is 20%.
Sunday Night
A slight chance of showers before 1am. Partly cloudy, with a low around 42. Northwest wind 11 to 18 mph. Chance of precipitation is 20%.
Columbus Day
Mostly sunny, with a high near 63.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
A slight chance of showers. Partly sunny, with a high near 62. Chance of precipitation is 20%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 49. Chance of precipitation is 30%.
Wednesday
A slight chance of showers. Partly sunny, with a high near 67. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Stephan SD
 44.25°N 99.47°W (Elev. 1867 ft)
Last Update:
6:36 pm CDT Oct 8, 2025
Forecast Valid:
6pm CDT Oct 8, 2025-6pm CDT Oct 15, 2025
 
Forecast Discussion
 
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Additional Resources

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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