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

Canby Airfield (KCNB)

Lat: 44.73°NLon: 96.27°WElev: 1194ft.

Thunderstorm Light Rain

67°F

19°C

Humidity 98%
Wind Speed S 12 G 17 mph
Barometer 29.95 in
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 16 Aug 5:35 am CDT
Extended Forecast for

Altamont SD

Severe T-storm Watch August 16, 05:53am until August 16, 06:00am
Click here for hazard details and duration
Severe T-storm Watch
  •  
    Severe T-storm Watch August 16, 05:53am until August 16, 06:00am

    NOW until 6:00am Sat

    Severe T-storm Watch

  • Overnight

    Low: 62 °F

    Severe
    Thunderstorms
    and Breezy

  • Saturday

    Saturday: A chance of showers and thunderstorms, mainly before 3pm. Partly sunny, with a high near 81. South southwest wind 9 to 18 mph becoming east northeast in the morning. Winds could gust as high as 30 mph. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 9pm, then a chance of showers and thunderstorms after 10pm. Increasing clouds, with a low around 66. East wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

    Low: 66 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms. Cloudy, then gradually becoming mostly sunny, with a high near 81. South southeast wind 11 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.

    High: 81 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 65. Southeast wind around 10 mph becoming northwest after midnight. Chance of precipitation is 40%.

    Low: 65 °F

    Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 79. North northwest wind around 10 mph.

    High: 79 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62. North northeast wind 6 to 9 mph.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78. Northeast wind 6 to 8 mph.

    High: 78 °F

    Mostly Sunny

Detailed Forecast

Overnight
Showers and thunderstorms likely. Some of the storms could be severe and produce heavy rainfall. Mostly cloudy, with a low around 62. Breezy, with a west wind around 22 mph, with gusts as high as 38 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of showers and thunderstorms, mainly before 3pm. Partly sunny, with a high near 81. South southwest wind 9 to 18 mph becoming east northeast in the morning. Winds could gust as high as 30 mph. Chance of precipitation is 40%.
Saturday Night
A slight chance of showers and thunderstorms before 9pm, then a chance of showers and thunderstorms after 10pm. Increasing clouds, with a low around 66. East wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Sunday
A chance of showers and thunderstorms. Cloudy, then gradually becoming mostly sunny, with a high near 81. South southeast wind 11 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 65. Southeast wind around 10 mph becoming northwest after midnight. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 79. North northwest wind around 10 mph.
Monday Night
Partly cloudy, with a low around 62. North northeast wind 6 to 9 mph.
Tuesday
Mostly sunny, with a high near 78. Northeast wind 6 to 8 mph.
Tuesday Night
Mostly clear, with a low around 59. Northeast wind 5 to 8 mph becoming southeast after midnight.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
Sunny, with a high near 83.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 62. Chance of precipitation is 30%.
Friday
A slight chance of showers. Mostly sunny, with a high near 77. Chance of precipitation is 20%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Altamont SD
 44.85°N 96.69°W (Elev. 1808 ft)
Last Update:
5:46 am CDT Aug 16, 2025
Forecast Valid:
5am CDT Aug 16, 2025-6pm CDT Aug 22, 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