Union County, SD Weather Forecast
County weather hub
Chance Showers And Thunderstorms
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 showers and thunderstorms before 1pm. Partly sunny, with a high near 81. Chance of precipitation is 50%.
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
- Aug 29, 2026
- Latest sync
- Aug 22, 2026 9:01 PM CDT
- Forecast office
- FSD
- Source
- NOAA / NWS
Daily Outlook
This Week in Union County
Saturday looks like the warmest upcoming period in Union County at 81 degrees F.
Saturday is the coolest period ahead with temperatures near 81 degrees F.
The strongest winds are forecast for Saturday at about 10 to 15 mph SSE.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Aug 22, 2026 9:01 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
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Aug 29
|
Chance Showers And Thunderstorms
|
81°F |
10 to 15 mph
SSE
|
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.
