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

Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

Hazardous Weather Conditions

Current conditions at

Pierre, Pierre Regional Airport (KPIR)

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

Partly Cloudy

89°F

32°C

Humidity 55%
Wind Speed E 10 G 18 mph
Barometer 29.90 in (1010.8 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 15 Aug 2:53 pm CDT
Extended Forecast for

Vivian SD

  • This Afternoon

    This Afternoon: Sunny, with a steady temperature around 87. East wind around 10 mph.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms, mainly after 9pm. Increasing clouds, with a low around 69. East wind 9 to 14 mph becoming north after midnight. Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms before 1pm, then a slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny and hot, with a high near 92. Heat index values as high as 99. East wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

    High: 92 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. East northeast wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    T-storms

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 1pm, then a slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 91. North wind around 10 mph. Chance of precipitation is 20%.

    High: 91 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 65. North northeast wind 6 to 10 mph. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Mostly sunny and hot, with a high near 91. North northeast wind 6 to 10 mph becoming east in the afternoon.

    High: 91 °F

    Hot

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 65. East wind 7 to 10 mph. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Sunny and hot, with a high near 92. East wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 92 °F

    Hot

Detailed Forecast

This Afternoon
Sunny, with a steady temperature around 87. East wind around 10 mph.
Tonight
A chance of showers and thunderstorms, mainly after 9pm. Increasing clouds, with a low around 69. East wind 9 to 14 mph becoming north after midnight. Chance of precipitation is 30%.
Saturday
A slight chance of showers and thunderstorms before 1pm, then a slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny and hot, with a high near 92. Heat index values as high as 99. East wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. East northeast wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Sunday
A slight chance of showers and thunderstorms before 1pm, then a slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 91. North wind around 10 mph. Chance of precipitation is 20%.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 65. North northeast wind 6 to 10 mph. Chance of precipitation is 20%.
Monday
Mostly sunny and hot, with a high near 91. North northeast wind 6 to 10 mph becoming east in the afternoon.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 65. East wind 7 to 10 mph. Chance of precipitation is 20%.
Tuesday
Sunny and hot, with a high near 92. East wind 7 to 11 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny and hot, with a high near 94.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Sunny and hot, with a high near 96.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Vivian SD
 43.92°N 100.29°W (Elev. 1880 ft)
Last Update:
3:32 pm CDT Aug 15, 2025
Forecast Valid:
3pm CDT Aug 15, 2025-6pm CDT Aug 21, 2025
 
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