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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Custer, Custer County Airport (KCUT)

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

Fair

54°F

12°C

Humidity 97%
Wind Speed Calm
Barometer 30.15 in (1015.0 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 19 Sep 12:53 am MDT
Extended Forecast for

Mount Rushmore SD

  • Overnight

    Overnight: A 50 percent chance of showers and thunderstorms, mainly before 3am. Patchy fog after 5am. Otherwise, cloudy, with a low around 56. Calm wind.

    Low: 56 °F

    Chance
    T-storms and
    Patchy Fog

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 9am. Patchy fog before 9am. Otherwise, cloudy, with a high near 63. Calm wind becoming southeast around 6 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 50%.

    High: 63 °F

    Chance
    Showers and
    Patchy Fog
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm, then showers after midnight. Low around 51. East wind 3 to 5 mph. Winds could gust as high as 17 mph. Chance of precipitation is 80%.

    Low: 51 °F

    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 55. East wind 3 to 6 mph. Winds could gust as high as 20 mph. Chance of precipitation is 90%.

    High: 55 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 47. East wind around 5 mph becoming calm in the evening. Winds could gust as high as 17 mph. Chance of precipitation is 100%.

    Low: 47 °F

    Showers then
    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly after noon. Mostly cloudy, with a high near 57. Calm wind becoming east around 6 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.

    High: 57 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 40 percent chance of showers before midnight. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance
    Showers then
    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers before midnight. Partly cloudy, with a low around 53.

    Low: 53 °F

    Slight Chance
    Showers then
    Partly Cloudy

Detailed Forecast

Overnight
A 50 percent chance of showers and thunderstorms, mainly before 3am. Patchy fog after 5am. Otherwise, cloudy, with a low around 56. Calm wind.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 9am. Patchy fog before 9am. Otherwise, cloudy, with a high near 63. Calm wind becoming southeast around 6 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 50%.
Saturday Night
Showers likely and possibly a thunderstorm, then showers after midnight. Low around 51. East wind 3 to 5 mph. Winds could gust as high as 17 mph. Chance of precipitation is 80%.
Sunday
Showers and possibly a thunderstorm. High near 55. East wind 3 to 6 mph. Winds could gust as high as 20 mph. Chance of precipitation is 90%.
Sunday Night
Showers and possibly a thunderstorm. Low around 47. East wind around 5 mph becoming calm in the evening. Winds could gust as high as 17 mph. Chance of precipitation is 100%.
Monday
Showers likely, mainly after noon. Mostly cloudy, with a high near 57. Calm wind becoming east around 6 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Monday Night
A 40 percent chance of showers before midnight. Mostly cloudy, with a low around 48.
Tuesday
Mostly sunny, with a high near 67.
Tuesday Night
A slight chance of showers before midnight. Partly cloudy, with a low around 53.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 73.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 54.
Thursday
Sunny, with a high near 76.
Thursday Night
Mostly clear, with a low around 55.
Friday
Mostly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Rushmore SD
 43.89°N 103.46°W (Elev. 5108 ft)
Last Update:
12:33 am MDT Sep 19, 2026
Forecast Valid:
1am MDT Sep 19, 2026-6pm MDT Sep 25, 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