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

23°F

-5°C

Humidity 85%
Wind Speed S 8 mph
Barometer 29.69 in (1008.5 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill14°F (-10°C)
Last update 17 Mar 10:53 pm CDT
Extended Forecast for

4 Miles ESE Castlewood SD

  • Tonight

    Tonight: Partly cloudy, with a low around 21. South wind 5 to 8 mph becoming west after midnight.

    Low: 21 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 44. West wind 8 to 11 mph.

    High: 44 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 31. Southwest wind 7 to 9 mph becoming northwest after midnight.

    Low: 31 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 51. North northwest wind 6 to 10 mph becoming southwest in the afternoon.

    High: 51 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 38. South southwest wind around 9 mph.

    Low: 38 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 64. West northwest wind 9 to 14 mph, with gusts as high as 22 mph.

    High: 64 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 41. West northwest wind around 10 mph becoming south after midnight.

    Low: 41 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 70. Southwest wind 10 to 16 mph, with gusts as high as 26 mph.

    High: 70 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 34. North wind around 15 mph, with gusts as high as 23 mph.

    Low: 34 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 21. South wind 5 to 8 mph becoming west after midnight.
Wednesday
Partly sunny, with a high near 44. West wind 8 to 11 mph.
Wednesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 31. Southwest wind 7 to 9 mph becoming northwest after midnight.
Thursday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 51. North northwest wind 6 to 10 mph becoming southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 38. South southwest wind around 9 mph.
Friday
Mostly sunny, with a high near 64. West northwest wind 9 to 14 mph, with gusts as high as 22 mph.
Friday Night
Partly cloudy, with a low around 41. West northwest wind around 10 mph becoming south after midnight.
Saturday
Mostly sunny, with a high near 70. Southwest wind 10 to 16 mph, with gusts as high as 26 mph.
Saturday Night
Mostly cloudy, with a low around 34. North wind around 15 mph, with gusts as high as 23 mph.
Sunday
Partly sunny, with a high near 44.
Sunday Night
Mostly cloudy, with a low around 22.
Monday
Partly sunny, with a high near 44.
Monday Night
Mostly cloudy, with a low around 27.
Tuesday
Partly sunny, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles ESE Castlewood SD
 44.72°N 96.96°W (Elev. 1749 ft)
Last Update:
10:36 pm CDT Mar 17, 2026
Forecast Valid:
11pm CDT Mar 17, 2026-6pm CDT Mar 24, 2026
 
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