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 >

Hazardous Weather Conditions

Current conditions at

ONIDAMUNC (K98D)

Lat: 44.7°NLon: 100.1°WElev: 1874ft.

Fair

88°F

31°C

Humidity 52%
Wind Speed SE 16 mph
Barometer 29.83 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 28 Aug 4:55 pm CDT
Extended Forecast for

Seneca SD

  • This Afternoon

    This Afternoon: A slight chance of showers and thunderstorms. Partly sunny, with a high near 86. Southeast wind around 17 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

    High: 86 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 64. East southeast wind 9 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.

    Low: 64 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 86. East wind 7 to 9 mph.

    High: 86 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, mainly before 3am. Mostly cloudy, with a low around 63. East northeast wind 9 to 11 mph. Chance of precipitation is 40%.

    Low: 63 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 87. East northeast wind around 11 mph becoming south in the afternoon. Winds could gust as high as 22 mph.

    High: 87 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61. South southeast wind around 11 mph becoming north northwest after midnight.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 83. North northwest wind around 11 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 60. South southwest wind around 7 mph becoming east in the evening.

    Low: 60 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Mostly sunny, with a high near 83. East wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
A slight chance of showers and thunderstorms. Partly sunny, with a high near 86. Southeast wind around 17 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
Tonight
A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 64. East southeast wind 9 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 86. East wind 7 to 9 mph.
Saturday Night
A chance of showers and thunderstorms, mainly before 3am. Mostly cloudy, with a low around 63. East northeast wind 9 to 11 mph. Chance of precipitation is 40%.
Sunday
Partly sunny, with a high near 87. East northeast wind around 11 mph becoming south in the afternoon. Winds could gust as high as 22 mph.
Sunday Night
Partly cloudy, with a low around 61. South southeast wind around 11 mph becoming north northwest after midnight.
Monday
Mostly sunny, with a high near 83. North northwest wind around 11 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph.
Monday Night
Partly cloudy, with a low around 60. South southwest wind around 7 mph becoming east in the evening.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 83. East wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 60. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64. Chance of precipitation is 20%.
Thursday
Partly sunny, with a high near 86.
Thursday Night
Mostly clear, with a low around 62.
Friday
Mostly sunny, with a high near 86.
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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:
4:06 pm CDT Aug 28, 2026
Forecast Valid:
5pm CDT Aug 28, 2026-6pm CDT Sep 4, 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