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

Heavy Rainfall Possible in the Upper Midwest, South Texas, and Puerto Rico and the Virgin Islands

Scattered thunderstorms and heavy rainfall may bring areas of flooding though the weekend over the Upper Midwest. A tropical disturbance will bring moderate to locally heavy rain to portions of South Texas into Saturday. Tropical Storm Erin may bring isolated flash and urban flooding, landslides or mudslides, and tropical storm conditions to Puerto Rico and the U.S. Virgin Islands. Read More >

Hazardous Weather Conditions

Current conditions at

Watertown, Watertown Municipal Airport (KATY)

Lat: 44.9°NLon: 97.15°WElev: 1745ft.

Mostly Cloudy

70°F

21°C

Humidity 84%
Wind Speed E 15 mph
Barometer 29.90 in (1011.5 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 15 Aug 8:53 am CDT
Extended Forecast for

Henry SD

  • Today

    Today: A slight chance of showers and thunderstorms before noon. Partly sunny, with a high near 84. East northeast wind 11 to 15 mph. Chance of precipitation is 20%.

    High: 84 °F

    Slight Chance
    T-storms then
    Partly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 67. East northeast wind 10 to 13 mph. Chance of precipitation is 50%.

    Low: 67 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 80. East northeast wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely, mainly between 1am and 4am, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 66. East northeast wind around 15 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 66 °F

    T-storms
    Likely

  • Sunday

    Sunday: A chance of showers and thunderstorms. Partly sunny, with a high near 79. East wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    High: 79 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 64. East northeast wind 8 to 13 mph. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 80. East northeast wind 7 to 9 mph.

    High: 80 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. East wind 6 to 10 mph.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81. Northeast wind 6 to 9 mph.

    High: 81 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers and thunderstorms before noon. Partly sunny, with a high near 84. East northeast wind 11 to 15 mph. Chance of precipitation is 20%.
Tonight
A chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 67. East northeast wind 10 to 13 mph. Chance of precipitation is 50%.
Saturday
A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 80. East northeast wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Saturday Night
Showers and thunderstorms likely, mainly between 1am and 4am, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 66. East northeast wind around 15 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 79. East wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 64. East northeast wind 8 to 13 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 80. East northeast wind 7 to 9 mph.
Monday Night
Partly cloudy, with a low around 63. East wind 6 to 10 mph.
Tuesday
Mostly sunny, with a high near 81. Northeast wind 6 to 9 mph.
Tuesday Night
Mostly clear, with a low around 62.
Wednesday
Sunny, with a high near 83.
Wednesday Night
Mostly clear, with a low around 63.
Thursday
Sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Henry SD
 44.88°N 97.48°W (Elev. 1818 ft)
Last Update:
9:46 am CDT Aug 15, 2025
Forecast Valid:
9am CDT Aug 15, 2025-6pm CDT Aug 21, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation