Weather World

Union County State Park, SD Weather Forecast

Feedback E-mail the Weather

Quick Weather Clicks

Union County State Park, SD Weather Forecast

Current Conditions

Settings

Overcast

75°F

Updated	10:00 pm
Feels Like	76°F
Humidity	88%
Wind	N 0 mph
Barometer	29.99 in
Dew Point	71°F

Overcast

24°C

Updated	10:00 pm
Feels Like	25°C
Humidity	88%
Wind	N 0 km/h
Barometer	101.5 kPa
Dew Point	22°C

WX Settings

°F °C°F °C

Text IconsText Icons

Sun & Moon

Converter

Cloud Cover	15%
uv UV Index	8
Sunrise	6:35 AM
Sunset	8:26 PM
Moonrise	12:16 PM
Moonset	10:30 PM

Civil Twilight
6:03 AM to 6:34 AM
8:24 PM to 8:55 PM
Union County State Park SD Weather - Waxing Crescent Moon

Waxing Crescent Moon

Union County State Park Weather Forecast

TONIGHT	TUESDAY	TUESDAY NIGHT	WEDNESDAY	WEDNESDAY NIGHT	THURSDAY	THURSDAY NIGHT	FRIDAY	FRIDAY NIGHT	SATURDAY	SATURDAY NIGHT	SUNDAY

Chance of T-Storm	Chance of T-Storm	Mostly Cloudy	Chance of T-Storm	Chance of T-Storm	Mostly Sunny	Mostly Clear	Clearing	Mostly Clear	Mostly Sunny	Partly Cloudy	Mostly Cloudy
Lo: 61°FLo: 16°C	Hi: 79°FHi: 26°C	Lo: 59°FLo: 15°C	Hi: 75°FHi: 24°C	Lo: 59°FLo: 15°C	Hi: 79°FHi: 26°C	Lo: 61°FLo: 16°C	Hi: 81°FHi: 27°C	Lo: 59°FLo: 15°C	Hi: 79°FHi: 26°C	Lo: 59°FLo: 15°C	Hi: 75°FHi: 24°C
POP: 50%	POP: 50%		POP: 50%	POP: 20%

POP = Probability of Precipitation.

Weather Outlook Updated: 824 PM CDT Mon Aug 17 2026 Union County State Park, SD Weather - WeatherWorld.com

Trending Headlines

Union County State Park Radar Loop

Use the map search tool if you want to place a location marker on the radar map...

Union County State Park Weather Map

Comprehensive Weather Maps

Union County State Park Quick Facts

National Two Day Weather Forecast

E-mail the Union County State Park Weather Forecast

Voice your opinion or tell us about page issues...

Union County State Park Forecast Discussion

Issued: 922 PM CDT Mon Aug 17 2026

Key Messages

Isolated to scattered storms are ongoing this evening, through development remains very uncertain. Risks of 1" hail and 60 mph will be possible.
Greater storm potential after midnight and through the overnight. Initial supercells are capable of producing 1-2" hail and wind gusts to 65 mph. Storms gradually grow into broken lines with a few bowing segments. Risks become wind gusts to 70 mph and marginal hail.
Lingering rain early Tuesday will push the gre...

Sponsored Links

Weather 101: Term of the Day

Mesoscale Discussion

When conditions actually begin to shape up for severe weather, SPC (Storm Prediction Center) often issues a Mesoscale Discussion (MCD) statement anywhere from roughly half an hour to several hours before issuing a weather watch. SPC also puts out MCDs for hazardous winter weather events on the mesoscale, such as locally heavy snow, blizzards and freezing rain (see below). MCDs are also issued on occasion for heavy rainfall, convective trends, and other phenomena, when the forecaster feels he/she can provide useful information that is not readily available or apparent to field forecasters. MCDs are based on mesoscale analysis and interpretation of observations and of short term, high resolution numerical model output. The MCD basically describes what is currently happening, what is expected in the next few hours, the meteorological reasoning for the forecast, and when/where SPC plans to issue the watch (if dealing with severe thunderstorm potential). Severe thunderstorm MCDs can help you get a little extra lead time on the weather and allow you to begin gearing up operations before a watch is issued. The MCD begins with a numerical string that gives the LAT/LON coordinates of a polygon that loosely describes the area being discussed.