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.

Fair

67°F

19°C

Humidity 61%
Wind Speed W 14 mph
Barometer 30.04 in (1017.4 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 3 Oct 4:53 pm CDT
Extended Forecast for

Castlewood SD

  • Tonight

    Tonight: Mostly clear, with a low around 44. Light west northwest wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 21 mph.

    Low: 44 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 66. Northwest wind 5 to 9 mph.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 44. Light and variable wind.

    Low: 44 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 69. Breezy, with a south wind 7 to 12 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph.

    High: 69 °F

    Sunny then
    Sunny and
    Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. South wind 13 to 18 mph, with gusts as high as 29 mph.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. South southwest wind 9 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 77 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 53. North northwest wind around 5 mph.

    Low: 53 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 70. North wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 70 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 51. Northwest wind around 5 mph becoming calm.

    Low: 51 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 44. Light west northwest wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 21 mph.
Sunday
Sunny, with a high near 66. Northwest wind 5 to 9 mph.
Sunday Night
Clear, with a low around 44. Light and variable wind.
Monday
Sunny, with a high near 69. Breezy, with a south wind 7 to 12 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph.
Monday Night
Mostly clear, with a low around 55. South wind 13 to 18 mph, with gusts as high as 29 mph.
Tuesday
Sunny, with a high near 77. South southwest wind 9 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph.
Tuesday Night
Mostly clear, with a low around 53. North northwest wind around 5 mph.
Wednesday
Sunny, with a high near 70. North wind 6 to 11 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 51. Northwest wind around 5 mph becoming calm.
Thursday
Mostly sunny, with a high near 69.
Thursday Night
Partly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 70.
Friday Night
Mostly clear, with a low around 57.
Saturday
Mostly sunny, with a high near 75. Breezy.
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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:
4:21 pm CDT Oct 3, 2026
Forecast Valid:
5pm CDT Oct 3, 2026-6pm CDT Oct 10, 2026
 
Forecast Discussion
 
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Additional Resources

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