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Areas of Severe Thunderstorms and Heat

Scattered severe thunderstorms and excessive rainfall are possible today in the Mid Atlantic, posing a risk for damaging winds and isolated flash flooding. Extreme Heat Warnings are in effect today for northeast Texas into southern Oklahoma and Arkansas. Extreme Heat Warnings are also in effect for the Desert Southwest today into Sunday. Read More >

Hazardous Weather Conditions

Current conditions at

Watertown, Watertown Municipal Airport (KATY)

Lat: 44.9°NLon: 97.15°WElev: 1745ft.

Mostly Cloudy

64°F

18°C

Humidity 90%
Wind Speed Calm
Barometer 30.00 in (1015.1 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 20 Aug 7:53 am CDT
Extended Forecast for

Watertown Municipal Airport SD

  • Today

    Today: A chance of showers before 10am, then a chance of rain and thunderstorms between 10am and 11am. Mostly sunny, with a high near 83. South wind 6 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers then
    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 57. Northwest wind 5 to 8 mph becoming light and variable after midnight.

    Low: 57 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 81. Calm wind becoming north 5 to 9 mph in the morning.

    High: 81 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 57. North wind 5 to 7 mph.

    Low: 57 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 77. North wind 6 to 9 mph.

    High: 77 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54. North northeast wind 5 to 7 mph becoming light and variable.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 78. South southeast wind 6 to 10 mph.

    High: 78 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 59. South southeast wind 9 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.

    Low: 59 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: A slight chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 81. South southeast wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
A chance of showers before 10am, then a chance of rain and thunderstorms between 10am and 11am. Mostly sunny, with a high near 83. South wind 6 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 30%.
Tonight
Partly cloudy, with a low around 57. Northwest wind 5 to 8 mph becoming light and variable after midnight.
Friday
Sunny, with a high near 81. Calm wind becoming north 5 to 9 mph in the morning.
Friday Night
Mostly clear, with a low around 57. North wind 5 to 7 mph.
Saturday
Sunny, with a high near 77. North wind 6 to 9 mph.
Saturday Night
Partly cloudy, with a low around 54. North northeast wind 5 to 7 mph becoming light and variable.
Sunday
Partly sunny, with a high near 78. South southeast wind 6 to 10 mph.
Sunday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 59. South southeast wind 9 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
Monday
A slight chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 81. South southeast wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 59.
Wednesday
Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Watertown Municipal Airport SD
 44.91°N 97.14°W (Elev. 1736 ft)
Last Update:
7:46 am CDT Aug 20, 2026
Forecast Valid:
8am CDT Aug 20, 2026-6pm CDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation