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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

ONIDAMUNC (K98D)

Lat: 44.7°NLon: 100.1°WElev: 1874ft.

Fair

79°F

26°C

Humidity 54%
Wind Speed E 14 mph
Barometer 30.01 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 27 Aug 7:55 pm CDT
Extended Forecast for

Seneca SD

  • Tonight

    Tonight: Mostly clear, with a low around 59. East southeast wind 10 to 14 mph.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers between 1pm and 2pm. Partly sunny, with a high near 86. Southeast wind 14 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    High: 86 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 40%.

    Low: 63 °F

    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 87. East northeast wind 8 to 10 mph.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 64. East northeast wind 9 to 11 mph. Chance of precipitation is 40%.

    Low: 64 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 86. North northeast wind around 11 mph becoming south southeast in the afternoon. Winds could gust as high as 21 mph.

    High: 86 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61. North northeast wind around 10 mph becoming east in the evening.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 84. North northwest wind 11 to 14 mph becoming south southwest in the afternoon. Winds could gust as high as 23 mph.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 60. Southwest wind 8 to 10 mph becoming east in the evening.

    Low: 60 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 59. East southeast wind 10 to 14 mph.
Friday
A slight chance of showers between 1pm and 2pm. Partly sunny, with a high near 86. Southeast wind 14 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 40%.
Saturday
Mostly sunny, with a high near 87. East northeast wind 8 to 10 mph.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 64. East northeast wind 9 to 11 mph. Chance of precipitation is 40%.
Sunday
Mostly sunny, with a high near 86. North northeast wind around 11 mph becoming south southeast in the afternoon. Winds could gust as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 61. North northeast wind around 10 mph becoming east in the evening.
Monday
Mostly sunny, with a high near 84. North northwest wind 11 to 14 mph becoming south southwest in the afternoon. Winds could gust as high as 23 mph.
Monday Night
Partly cloudy, with a low around 60. Southwest wind 8 to 10 mph becoming east in the evening.
Tuesday
A slight chance of showers after 1pm. Mostly sunny, with a high near 83. Chance of precipitation is 20%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 59. Chance of precipitation is 30%.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 85. Chance of precipitation is 20%.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 62. Chance of precipitation is 20%.
Thursday
Partly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Seneca SD
 45.06°N 99.51°W (Elev. 1893 ft)
Last Update:
8:06 pm CDT Aug 27, 2026
Forecast Valid:
8pm CDT Aug 27, 2026-6pm CDT Sep 3, 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