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.

Thunderstorm in Vicinity Light Rain

74°F

23°C

Humidity 82%
Wind Speed W 7 mph
Barometer 29.98 in (1013.9 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 25 Jul 11:53 pm CDT
Extended Forecast for

Castlewood SD

Extreme Heat Warning until July 26, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning until July 26, 09:00pm

    NOW until 9:00pm Sun

    Extreme Heat Warning

  • Overnight

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers before 7am. Mostly sunny and hot, with a high near 97. Heat index values as high as 106. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 97 °F

    Chance
    Showers then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 72. Southwest wind 5 to 7 mph becoming northwest after midnight.

    Low: 72 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny and hot, with a high near 93. North wind 9 to 11 mph, with gusts as high as 20 mph.

    High: 93 °F

    Hot

  • Monday Night

    Monday Night: Partly cloudy, with a low around 70. Northeast wind around 6 mph.

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 92. East wind around 6 mph becoming south southeast in the afternoon.

    High: 92 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68. Southeast wind 3 to 6 mph.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 93. South wind 6 to 10 mph.

    High: 93 °F

    Hot

Detailed Forecast

Overnight
A chance of showers and thunderstorms, mainly between 3am and 5am. Mostly cloudy, with a low around 72. West wind around 6 mph becoming south. Chance of precipitation is 30%.
Sunday
A chance of showers before 7am. Mostly sunny and hot, with a high near 97. Heat index values as high as 106. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Sunday Night
Mostly clear, with a low around 72. Southwest wind 5 to 7 mph becoming northwest after midnight.
Monday
Mostly sunny and hot, with a high near 93. North wind 9 to 11 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 70. Northeast wind around 6 mph.
Tuesday
Mostly sunny and hot, with a high near 92. East wind around 6 mph becoming south southeast in the afternoon.
Tuesday Night
Mostly clear, with a low around 68. Southeast wind 3 to 6 mph.
Wednesday
Sunny and hot, with a high near 93. South wind 6 to 10 mph.
Wednesday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. South southeast wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 89. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 50%.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 88.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castlewood SD
 44.72°N 97.02°W (Elev. 1683 ft)
Last Update:
12:36 am CDT Jul 26, 2026
Forecast Valid:
12am CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
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