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

Heat Builds in the West; Severe Thunderstorms and Heavy Rain in the Upper Midwest and Mid-Mississippi Valley; Extremely Critical Fire Weather in the Northwest on Saturday

A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Severe thunderstorms and heavy rainfall are expected over parts of the Upper Midwest to mid-Mississippi Valley today. Critical to extremely critical fire weather conditions from the Northwest and the northern Great Basin on Saturday and Sunday. Read More >

Current conditions at

Watertown, Watertown Municipal Airport (KATY)

Lat: 44.9°NLon: 97.15°WElev: 1745ft.

Light Rain

62°F

17°C

Humidity 90%
Wind Speed NE 16 G 30 mph
Barometer 29.97 in (1014.2 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 31 Jul 8:53 am CDT
Extended Forecast for

Henry SD

  • Today

    Today: Patchy smoke before 11am. Mostly cloudy, with a high near 76. North northeast wind 16 to 18 mph, with gusts as high as 30 mph.

    High: 76 °F

    Patchy Smoke
    then Mostly
    Cloudy

  • Tonight

    Tonight: Patchy smoke before 11pm. Partly cloudy, with a low around 59. North wind 7 to 14 mph.

    Low: 59 °F

    Patchy Smoke
    then Partly
    Cloudy

  • Saturday

    Saturday: Sunny, with a high near 81. North wind 6 to 8 mph.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 61. South southeast wind 5 to 8 mph.

    Low: 61 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 83. Breezy, with a south wind 10 to 15 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 31 mph.

    High: 83 °F

    Sunny then
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 66. Breezy, with a south wind around 21 mph, with gusts as high as 31 mph.

    Low: 66 °F

    Mostly Clear
    and Breezy

  • Monday

    Monday: Mostly sunny, with a high near 85. Breezy, with a south wind 20 to 23 mph, with gusts as high as 33 mph.

    High: 85 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 60. Breezy, with a south wind 15 to 21 mph becoming northeast after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 60%.

    Low: 60 °F

    Chance
    T-storms and
    Breezy then
    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers before 1pm. Partly sunny, with a high near 71. North wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

    High: 71 °F

    Chance
    Showers

Detailed Forecast

Today
Patchy smoke before 11am. Mostly cloudy, with a high near 76. North northeast wind 16 to 18 mph, with gusts as high as 30 mph.
Tonight
Patchy smoke before 11pm. Partly cloudy, with a low around 59. North wind 7 to 14 mph.
Saturday
Sunny, with a high near 81. North wind 6 to 8 mph.
Saturday Night
Clear, with a low around 61. South southeast wind 5 to 8 mph.
Sunday
Sunny, with a high near 83. Breezy, with a south wind 10 to 15 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 31 mph.
Sunday Night
Mostly clear, with a low around 66. Breezy, with a south wind around 21 mph, with gusts as high as 31 mph.
Monday
Mostly sunny, with a high near 85. Breezy, with a south wind 20 to 23 mph, with gusts as high as 33 mph.
Monday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 60. Breezy, with a south wind 15 to 21 mph becoming northeast after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 60%.
Tuesday
A chance of showers before 1pm. Partly sunny, with a high near 71. North wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.
Tuesday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 56. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 74.
Wednesday Night
Partly cloudy, with a low around 59.
Thursday
Mostly sunny, with a high near 80.
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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:
9:32 am CDT Jul 31, 2026
Forecast Valid:
10am CDT Jul 31, 2026-6pm CDT Aug 6, 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