Union County, SD Weather Forecast
County weather hub
Chance Rain Showers
Compare major city weather across Union County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A chance of rain showers. Partly sunny, with a high near 69. Chance of precipitation is 40%.
County Weather Overview
This county weather page brings together forecast coverage for Union County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 3 of 3 mapped cities in Union County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Apr 15, 2026
- Latest sync
- Apr 9, 2026 7:57 PM CDT
- Forecast office
- FSD
- Source
- NOAA / NWS
Daily Outlook
This Week in Union County
Wednesday looks like the warmest upcoming period in Union County at 69 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 46 degrees F.
The strongest winds are forecast for Wednesday at about 10 to 15 mph WNW.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 7:57 PM CDT
- Coverage
- 1 day
- Time zone
- America/Chicago
- Forecast office
- FSD
- Radar station
- KFSD
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of rain showers before 1am. Partly cloudy, with a low around 46. Chance of precipitation is 40%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Apr 15
|
Chance Rain Showers
|
69°F |
10 to 15 mph
WNW
|
|
Wednesday Night
Apr 15
|
Chance Rain Showers
|
46°F |
10 mph
SW
|
Major City Forecasts
Live forecast snapshots for major cities across Union County.
Coverage
Forecast coverage currently spans 3 of 3 mapped cities in Union County.
Largest mapped city population in this region: 2,928.
