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

40°F

4°C

Humidity 93%
Wind Speed Calm
Barometer 30.26 in (1025.3 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 5 Oct 3:53 am CDT
Extended Forecast for

Castlewood SD

  • Overnight

    Overnight: Partly cloudy, with a low around 40. Southeast wind 3 to 5 mph.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 72. Breezy, with a south wind 7 to 12 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 33 mph.

    High: 72 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 53. Breezy, with a south wind 10 to 20 mph, with gusts as high as 32 mph.

    Low: 53 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. South southwest wind 6 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 77 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 49. North northwest wind around 6 mph.

    Low: 49 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 70. Northwest 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 47. Northwest wind 3 to 5 mph.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 67. Light and variable wind becoming west 5 to 8 mph in the morning.

    High: 67 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 46. East wind 3 to 5 mph.

    Low: 46 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 40. Southeast wind 3 to 5 mph.
Monday
Partly sunny, then gradually becoming sunny, with a high near 72. Breezy, with a south wind 7 to 12 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 33 mph.
Monday Night
Mostly clear, with a low around 53. Breezy, with a south wind 10 to 20 mph, with gusts as high as 32 mph.
Tuesday
Sunny, with a high near 77. South southwest wind 6 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 49. North northwest wind around 6 mph.
Wednesday
Sunny, with a high near 70. Northwest wind 6 to 11 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 47. Northwest wind 3 to 5 mph.
Thursday
Partly sunny, with a high near 67. Light and variable wind becoming west 5 to 8 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 46. East wind 3 to 5 mph.
Friday
Mostly sunny, with a high near 68.
Friday Night
Partly cloudy, with a low around 54.
Saturday
Mostly sunny, with a high near 75. Breezy.
Saturday Night
Partly cloudy, with a low around 56. Breezy.
Sunday
Mostly sunny, with a high near 66. Breezy.
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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:
3:21 am CDT Oct 5, 2026
Forecast Valid:
3am CDT Oct 5, 2026-6pm CDT Oct 11, 2026
 
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Additional Resources

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