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

Hazardous Weather Conditions

Current conditions at

Watertown, Watertown Municipal Airport (KATY)

Lat: 44.9°NLon: 97.15°WElev: 1745ft.

Overcast

65°F

18°C

Humidity 90%
Wind Speed S 14 mph
Barometer 29.92 in (1012.8 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 26 Sep 2:53 pm CDT
Extended Forecast for

Castlewood SD

  • This Afternoon

    This Afternoon: A chance of sprinkles. Patchy fog. Otherwise, cloudy, with a high near 66. South southeast wind around 11 mph, with gusts as high as 21 mph.

    High: 66 °F

    Chance
    Sprinkles and
    Patchy Fog

  • Tonight

    Tonight: A slight chance of showers between 9pm and 10pm. Patchy fog. Otherwise, cloudy, with a low around 59. South southeast wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 59 °F

    Slight Chance
    Showers and
    Patchy Fog
    then Patchy
    Fog

  • Sunday

    Sunday: Areas of fog before noon. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 72. Calm wind becoming northeast 5 to 9 mph in the morning.

    High: 72 °F

    Areas Fog
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 56. East southeast wind around 6 mph.

    Low: 56 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 70. South wind 7 to 16 mph, with gusts as high as 26 mph.

    High: 70 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Cloudy, with a low around 59. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 59 °F

    Cloudy then
    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 69. South southwest wind 9 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 70%.

    High: 69 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 53. Northwest wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 71. South southwest wind 5 to 8 mph.

    High: 71 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A chance of sprinkles. Patchy fog. Otherwise, cloudy, with a high near 66. South southeast wind around 11 mph, with gusts as high as 21 mph.
Tonight
A slight chance of showers between 9pm and 10pm. Patchy fog. Otherwise, cloudy, with a low around 59. South southeast wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 20%.
Sunday
Areas of fog before noon. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 72. Calm wind becoming northeast 5 to 9 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 56. East southeast wind around 6 mph.
Monday
Mostly cloudy, with a high near 70. South wind 7 to 16 mph, with gusts as high as 26 mph.
Monday Night
Showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Cloudy, with a low around 59. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 69. South southwest wind 9 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 70%.
Tuesday Night
Mostly cloudy, with a low around 53. Northwest wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 71. South southwest wind 5 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
Mostly sunny, with a high near 66.
Thursday Night
Mostly clear, with a low around 48.
Friday
A slight chance of showers. Mostly sunny, with a high near 64. Chance of precipitation is 20%.
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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:
3:31 pm CDT Sep 26, 2026
Forecast Valid:
3pm CDT Sep 26, 2026-6pm CDT Oct 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation