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

Watertown, Watertown Municipal Airport (KATY)

Lat: 44.9°NLon: 97.15°WElev: 1745ft.

Partly Cloudy

26°F

-3°C

Humidity 81%
Wind Speed N 17 mph
Barometer 29.90 in (1014.3 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 9 Mar 11:53 pm CDT
Extended Forecast for

Castlewood SD

  • Overnight

    Overnight: Mostly cloudy, with a low around 24. Northeast wind 13 to 15 mph, with gusts as high as 25 mph.

    Low: 24 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain and snow after 5pm. Mostly cloudy, with a high near 38. Northeast wind 10 to 13 mph. Chance of precipitation is 10%.

    High: 38 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Snow before 8pm, then rain and snow between 8pm and 9pm, then snow after 9pm. Low around 25. North northeast wind 8 to 11 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    Low: 25 °F

    Rain/Snow
    then Snow

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 40. Northwest wind 8 to 14 mph, with gusts as high as 23 mph.

    High: 40 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 23. Northwest wind 6 to 10 mph becoming south after midnight.

    Low: 23 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain and snow after 1pm. Mostly cloudy, with a high near 48. South wind 11 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.

    High: 48 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: A chance of rain and snow before 1am. Mostly cloudy, with a low around 24. West wind 14 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 30%.

    Low: 24 °F

    Chance
    Rain/Snow

  • Friday

    Friday: Mostly cloudy, with a high near 37. North northwest wind 9 to 11 mph.

    High: 37 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A chance of snow. Cloudy, with a low around 25. East southeast wind around 9 mph. Chance of precipitation is 40%.

    Low: 25 °F

    Chance Snow

Detailed Forecast

Overnight
Mostly cloudy, with a low around 24. Northeast wind 13 to 15 mph, with gusts as high as 25 mph.
Tuesday
A slight chance of rain and snow after 5pm. Mostly cloudy, with a high near 38. Northeast wind 10 to 13 mph. Chance of precipitation is 10%.
Tuesday Night
Snow before 8pm, then rain and snow between 8pm and 9pm, then snow after 9pm. Low around 25. North northeast wind 8 to 11 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 40. Northwest wind 8 to 14 mph, with gusts as high as 23 mph.
Wednesday Night
Partly cloudy, with a low around 23. Northwest wind 6 to 10 mph becoming south after midnight.
Thursday
A chance of rain and snow after 1pm. Mostly cloudy, with a high near 48. South wind 11 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.
Thursday Night
A chance of rain and snow before 1am. Mostly cloudy, with a low around 24. West wind 14 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 30%.
Friday
Mostly cloudy, with a high near 37. North northwest wind 9 to 11 mph.
Friday Night
A chance of snow. Cloudy, with a low around 25. East southeast wind around 9 mph. Chance of precipitation is 40%.
Saturday
A chance of snow. Cloudy, with a high near 38. Chance of precipitation is 40%.
Saturday Night
Snow likely. Cloudy, with a low around 14. Chance of precipitation is 70%.
Sunday
A chance of snow. Mostly cloudy, with a high near 23. Blustery. Chance of precipitation is 40%.
Sunday Night
Partly cloudy, with a low around 5.
Monday
Partly sunny, with a high near 25.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castlewood SD
 44.72°N 97.02°W (Elev. 1683 ft)
Last Update:
11:36 pm CDT Mar 9, 2026
Forecast Valid:
12am CDT Mar 10, 2026-6pm CDT Mar 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation