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

Excessive Rainfall and Tropical Storm in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce considerable, potentially life-threatening, flooding across the lower Mississippi River Valley and central Great Lakes region through tonight. Tropical Storm Arthur will move northeastward along the Texas coast today and then move inland over southwestern Louisiana by tonight. An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana. Read More >

Hazardous Weather Conditions

Current conditions at

Custer, Custer County Airport (KCUT)

Lat: 43.73°NLon: 103.62°WElev: 5600ft.

Partly Cloudy

66°F

19°C

Humidity 25%
Wind Speed W 18 G 35 mph
Barometer 29.81 in (1003.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 17 Jun 1:53 pm MDT
Extended Forecast for

4 Miles SSW Custer County Airport SD

Red Flag Warning June 17, 02:07pm until June 17, 08:00pm
Click here for hazard details and duration
Red Flag Warning
  •  
    Red Flag Warning June 17, 02:07pm until June 17, 08:00pm

    NOW until 8:00pm Wed

    Red Flag Warning

  • This Afternoon

    High: 67 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 47. Northwest wind 12 to 17 mph becoming light west. Winds could gust as high as 31 mph.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 68. West wind 5 to 8 mph, with gusts as high as 22 mph.

    High: 68 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 48. Northwest wind around 6 mph becoming east in the evening. Winds could gust as high as 17 mph.

    Low: 48 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 72. Light and variable wind becoming southeast 5 to 8 mph in the morning. Winds could gust as high as 20 mph.

    High: 72 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers after midnight. Partly cloudy, with a low around 51. East wind 5 to 7 mph, with gusts as high as 20 mph.

    Low: 51 °F

    Partly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: A chance of showers, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 70. Chance of precipitation is 60%.

    High: 70 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 67. Northwest wind around 18 mph, with gusts as high as 36 mph.
Tonight
Partly cloudy, with a low around 47. Northwest wind 12 to 17 mph becoming light west. Winds could gust as high as 31 mph.
Thursday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 68. West wind 5 to 8 mph, with gusts as high as 22 mph.
Thursday Night
Partly cloudy, with a low around 48. Northwest wind around 6 mph becoming east in the evening. Winds could gust as high as 17 mph.
Juneteenth
Mostly sunny, with a high near 72. Light and variable wind becoming southeast 5 to 8 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
A 30 percent chance of showers after midnight. Partly cloudy, with a low around 51. East wind 5 to 7 mph, with gusts as high as 20 mph.
Saturday
A chance of showers, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 70. Chance of precipitation is 60%.
Saturday Night
Showers and possibly a thunderstorm. Mostly cloudy, with a low around 51.
Sunday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 65.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 47.
Monday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 65.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 48.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 68.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Custer County Airport SD
 43.69°N 103.65°W (Elev. 5400 ft)
Last Update:
12:58 pm MDT Jun 17, 2026
Forecast Valid:
2pm MDT Jun 17, 2026-6pm MDT Jun 23, 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