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 and Breezy

72°F

22°C

Humidity 34%
Wind Speed W 22 G 31 mph
Barometer 29.96 in (1014.1 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 19 Jun 5:53 pm CDT
Extended Forecast for

Castlewood SD

  • Tonight

    Tonight: Mostly clear, with a low around 47. West northwest wind 13 to 18 mph becoming light north northwest after midnight. Winds could gust as high as 29 mph.

    Low: 47 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 76. Calm wind becoming north around 5 mph in the afternoon.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers between 2am and 3am. Increasing clouds, with a low around 54. East wind 6 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

    Low: 54 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, mainly after 7am. Cloudy, with a high near 69. East wind 13 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.

    High: 69 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A slight chance of showers. Mostly cloudy, with a low around 51. Northeast wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 51 °F

    Slight Chance
    Showers

  • Monday

    Monday: Partly sunny, with a high near 73. Northeast wind around 5 mph becoming southeast in the afternoon.

    High: 73 °F

    Partly Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 54. Southeast wind 3 to 5 mph. Chance of precipitation is 60%.

    Low: 54 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 73. Southwest wind 7 to 16 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 50%.

    High: 73 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 1am. Mostly clear, with a low around 51. Northwest wind 6 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    Low: 51 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 47. West northwest wind 13 to 18 mph becoming light north northwest after midnight. Winds could gust as high as 29 mph.
Saturday
Sunny, with a high near 76. Calm wind becoming north around 5 mph in the afternoon.
Saturday Night
A slight chance of showers between 2am and 3am. Increasing clouds, with a low around 54. East wind 6 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Sunday
A chance of showers, mainly after 7am. Cloudy, with a high near 69. East wind 13 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.
Sunday Night
A slight chance of showers. Mostly cloudy, with a low around 51. Northeast wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Monday
Partly sunny, with a high near 73. Northeast wind around 5 mph becoming southeast in the afternoon.
Monday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 54. Southeast wind 3 to 5 mph. Chance of precipitation is 60%.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 73. Southwest wind 7 to 16 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 50%.
Tuesday Night
A slight chance of showers and thunderstorms before 1am. Mostly clear, with a low around 51. Northwest wind 6 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 73.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Mostly sunny, with a high near 76.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 54. Chance of precipitation is 20%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 78. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castlewood SD
 44.72°N 97.02°W (Elev. 1683 ft)
Last Update:
5:36 pm CDT Jun 19, 2026
Forecast Valid:
6pm CDT Jun 19, 2026-6pm CDT Jun 26, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation