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

63°F

17°C

Humidity 97%
Wind Speed SW 8 mph
Barometer 29.97 in (1014.0 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 25 Aug 6:53 am CDT
Extended Forecast for

Altamont SD

  • Today

    Today: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 82. West wind 8 to 18 mph, with gusts as high as 30 mph.

    High: 82 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. West northwest wind 9 to 14 mph, with gusts as high as 23 mph.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. North northwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56. North northwest wind 5 to 9 mph.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 78. North wind 3 to 7 mph.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55. Northeast wind around 6 mph becoming light and variable.

    Low: 55 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81. South southeast wind 6 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 81 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 83. South wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    High: 83 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 82. West wind 8 to 18 mph, with gusts as high as 30 mph.
Tonight
Mostly clear, with a low around 60. West northwest wind 9 to 14 mph, with gusts as high as 23 mph.
Wednesday
Mostly sunny, with a high near 78. North northwest wind 10 to 16 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 56. North northwest wind 5 to 9 mph.
Thursday
Sunny, with a high near 78. North wind 3 to 7 mph.
Thursday Night
Mostly clear, with a low around 55. Northeast wind around 6 mph becoming light and variable.
Friday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81. South southeast wind 6 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Saturday
A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 83. South wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Saturday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64. Chance of precipitation is 30%.
Sunday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 83. Chance of precipitation is 20%.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 62. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Altamont SD
 44.83°N 96.72°W (Elev. 1860 ft)
Last Update:
7:06 am CDT Aug 25, 2026
Forecast Valid:
7am CDT Aug 25, 2026-6pm CDT Aug 31, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation