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.

A Few Clouds

69°F

21°C

Humidity 87%
Wind Speed S 6 mph
Barometer 29.93 in (1012.5 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 24 Jul 10:53 pm CDT
Extended Forecast for

Henry SD

Heat Advisory July 25, 01:00pm until July 26, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: A chance of showers and thunderstorms before midnight. Mostly clear, with a low around 66. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    T-storms

  • Saturday

    Saturday: Patchy smoke after 1pm. Sunny and hot, with a high near 98. South wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 98 °F

    Sunny then
    Patchy Smoke

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 76. South wind 9 to 13 mph, with gusts as high as 21 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 1pm. Cloudy through mid morning, then gradual clearing and hot, with a high near 96. Heat index values as high as 103. South wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 96 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 72. South southeast wind 8 to 10 mph becoming northeast after midnight.

    Low: 72 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 94. North wind 8 to 11 mph.

    High: 94 °F

    Hot

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. East northeast wind around 7 mph. Chance of precipitation is 20%.

    Low: 70 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 92. East wind 7 to 9 mph becoming south in the afternoon.

    High: 92 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69. East wind around 8 mph.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms before midnight. Mostly clear, with a low around 66. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Saturday
Patchy smoke after 1pm. Sunny and hot, with a high near 98. South wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Increasing clouds, with a low around 76. South wind 9 to 13 mph, with gusts as high as 21 mph.
Sunday
A slight chance of showers and thunderstorms before 1pm. Cloudy through mid morning, then gradual clearing and hot, with a high near 96. Heat index values as high as 103. South wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 72. South southeast wind 8 to 10 mph becoming northeast after midnight.
Monday
Sunny and hot, with a high near 94. North wind 8 to 11 mph.
Monday Night
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. East northeast wind around 7 mph. Chance of precipitation is 20%.
Tuesday
Mostly sunny and hot, with a high near 92. East wind 7 to 9 mph becoming south in the afternoon.
Tuesday Night
Mostly clear, with a low around 69. East wind around 8 mph.
Wednesday
Mostly sunny and hot, with a high near 92.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 70. Chance of precipitation is 20%.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny and hot, with a high near 91. Chance of precipitation is 20%.
Thursday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 67. Chance of precipitation is 20%.
Friday
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:
10:31 pm CDT Jul 24, 2026
Forecast Valid:
11pm CDT Jul 24, 2026-6pm CDT Jul 31, 2026
 
Forecast Discussion
 
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Additional Resources

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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