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

68°F

20°C

Humidity 94%
Wind Speed SE 13 mph
Barometer 29.99 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 28 Aug 9:35 am CDT
Extended Forecast for

Tolstoy SD

  • Today

    Today: A slight chance of showers before 2pm. Partly sunny, with a high near 86. Southeast wind 13 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.

    High: 86 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 2am. Increasing clouds, with a low around 62. Southeast wind 8 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 62 °F

    T-storms
    Likely

  • Saturday

    Saturday: Partly sunny, with a high near 86. East wind 6 to 9 mph.

    High: 86 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly clear during the early evening, then becoming mostly cloudy, with a low around 62. East northeast wind 10 to 13 mph. Chance of precipitation is 50%.

    Low: 62 °F

    Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 86. Northeast wind around 11 mph becoming southeast in the afternoon. Winds could gust as high as 20 mph.

    High: 86 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 60. East southeast wind around 11 mph becoming northwest after midnight. Chance of precipitation is 30%.

    Low: 60 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 83. Northwest wind 11 to 13 mph, with gusts as high as 21 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. Southwest wind 7 to 10 mph becoming south southeast in the evening.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers after 1pm. Mostly sunny, with a high near 83. East northeast wind 7 to 13 mph becoming south southeast in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 20%.

    High: 83 °F

    Partly Sunny
    then Slight
    Chance
    Showers

Detailed Forecast

Today
A slight chance of showers before 2pm. Partly sunny, with a high near 86. Southeast wind 13 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Tonight
Showers and thunderstorms likely, mainly before 2am. Increasing clouds, with a low around 62. Southeast wind 8 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Partly sunny, with a high near 86. East wind 6 to 9 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly clear during the early evening, then becoming mostly cloudy, with a low around 62. East northeast wind 10 to 13 mph. Chance of precipitation is 50%.
Sunday
Mostly sunny, with a high near 86. Northeast wind around 11 mph becoming southeast in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 60. East southeast wind around 11 mph becoming northwest after midnight. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 83. Northwest wind 11 to 13 mph, with gusts as high as 21 mph.
Monday Night
Mostly clear, with a low around 58. Southwest wind 7 to 10 mph becoming south southeast in the evening.
Tuesday
A slight chance of showers after 1pm. Mostly sunny, with a high near 83. East northeast wind 7 to 13 mph becoming south southeast in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 20%.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 59. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 62.
Thursday
Mostly sunny, with a high near 86.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Tolstoy SD
 45.21°N 99.61°W (Elev. 1900 ft)
Last Update:
9:06 am CDT Aug 28, 2026
Forecast Valid:
9am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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