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.

Overcast

79°F

26°C

Humidity 77%
Wind Speed Vrbl 5 mph
Barometer 29.62 in (1001.8 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 28 Jun 6:53 pm CDT
Extended Forecast for

Watertown SD

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 10pm. Patchy smoke before 3am, then patchy smoke after 4am. Patchy fog before 3am, then patchy fog after 4am. Otherwise, mostly cloudy, with a low around 71. East wind 5 to 9 mph. Chance of precipitation is 20%.

    Low: 71 °F

    Slight Chance
    T-storms then
    Patchy Fog

  • Monday

    Monday: Mostly sunny and hot, with a high near 93. Heat index values as high as 98. Breezy, with an east southeast wind 13 to 22 mph becoming southwest in the afternoon. Winds could gust as high as 33 mph.

    High: 93 °F

    Hot and
    Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 65. South wind 10 to 17 mph, with gusts as high as 28 mph.

    Low: 65 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 87. West southwest wind 9 to 14 mph, with gusts as high as 25 mph.

    High: 87 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 65. West wind 5 to 9 mph becoming southeast after midnight. Chance of precipitation is 40%.

    Low: 65 °F

    Mostly Clear
    then Chance
    T-storms

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. South wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 88 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66. Northwest wind 5 to 7 mph becoming east southeast after midnight. Chance of precipitation is 50%.

    Low: 66 °F

    Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 91. South southeast wind 6 to 9 mph. Chance of precipitation is 20%.

    High: 91 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Southeast wind 6 to 9 mph. Chance of precipitation is 70%.

    Low: 68 °F

    Showers
    Likely

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms before 10pm. Patchy smoke before 3am, then patchy smoke after 4am. Patchy fog before 3am, then patchy fog after 4am. Otherwise, mostly cloudy, with a low around 71. East wind 5 to 9 mph. Chance of precipitation is 20%.
Monday
Mostly sunny and hot, with a high near 93. Heat index values as high as 98. Breezy, with an east southeast wind 13 to 22 mph becoming southwest in the afternoon. Winds could gust as high as 33 mph.
Monday Night
Mostly clear, with a low around 65. South wind 10 to 17 mph, with gusts as high as 28 mph.
Tuesday
Sunny, with a high near 87. West southwest wind 9 to 14 mph, with gusts as high as 25 mph.
Tuesday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 65. West wind 5 to 9 mph becoming southeast after midnight. Chance of precipitation is 40%.
Wednesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. South wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66. Northwest wind 5 to 7 mph becoming east southeast after midnight. Chance of precipitation is 50%.
Thursday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 91. South southeast wind 6 to 9 mph. Chance of precipitation is 20%.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Southeast wind 6 to 9 mph. Chance of precipitation is 70%.
Friday
Mostly sunny and hot, with a high near 92.
Friday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 70. Chance of precipitation is 40%.
Independence Day
A chance of showers and thunderstorms. Mostly sunny and hot, with a high near 91. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 50%.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 85. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Watertown SD
 44.91°N 97.17°W (Elev. 1755 ft)
Last Update:
7:36 pm CDT Jun 28, 2026
Forecast Valid:
7pm CDT Jun 28, 2026-6pm CDT Jul 5, 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