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

Pierre, Pierre Regional Airport (KPIR)

Lat: 44.38°NLon: 100.29°WElev: 1742ft.

Fair

75°F

24°C

Humidity 69%
Wind Speed E 13 mph
Barometer 29.92 in (1011.5 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 15 Aug 8:53 am CDT
Extended Forecast for

Agar SD

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 86. East wind around 16 mph, with gusts as high as 24 mph.

    High: 86 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: A chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 63. East wind 13 to 17 mph. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 82. East northeast wind 13 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    High: 82 °F

    Slight 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 64. East northeast wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 64 °F

    T-storms
    Likely

  • Sunday

    Sunday: A chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 82. East northeast wind around 10 mph. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 61. East northeast wind 7 to 11 mph. Chance of precipitation is 20%.

    Low: 61 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 86. East wind 7 to 9 mph.

    High: 86 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 62. East wind 7 to 10 mph.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 89. East wind 7 to 10 mph.

    High: 89 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 86. East wind around 16 mph, with gusts as high as 24 mph.
Tonight
A chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 63. East wind 13 to 17 mph. Chance of precipitation is 30%.
Saturday
A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 82. East northeast wind 13 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
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 64. East northeast wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
A chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 82. East northeast wind around 10 mph. Chance of precipitation is 30%.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 61. East northeast wind 7 to 11 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 86. East wind 7 to 9 mph.
Monday Night
Mostly clear, with a low around 62. East wind 7 to 10 mph.
Tuesday
Sunny, with a high near 89. East wind 7 to 10 mph.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Sunny, with a high near 89.
Wednesday Night
Mostly clear, with a low around 63.
Thursday
Sunny and hot, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Agar SD
 44.83°N 100.07°W (Elev. 1824 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

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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