Union County, SD Weather Forecast
County weather hub
Sunny
Compare major city weather across Union County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 93. South wind 5 to 10 mph.
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
- Jul 14 to Jul 18, 2026
- Latest sync
- Jul 12, 2026 3:02 PM CDT
- Forecast office
- FSD
- Source
- NOAA / NWS
Daily Outlook
This Week in Union County
Thursday looks like the warmest upcoming period in Union County at 97 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 67 degrees F.
The strongest winds are forecast for Wednesday at about 0 to 15 mph S.
The forecast from Jul 14 through Jul 18 stays mostly dry.
Forecast Details
- Last updated
- Jul 12, 2026 3:02 PM CDT
- Coverage
- 5 days
- 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
Clear, with a low around 67. South wind 5 to 10 mph.
Sunny, with a high near 96.
Clear, with a low around 69.
Sunny, with a high near 97.
Mostly clear, with a low around 74.
Sunny, with a high near 97.
Mostly clear, with a low around 74.
Sunny, with a high near 97.
Mostly clear, with a low around 74.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Jul 14
|
Sunny
|
93°F |
5 to 10 mph
S
|
|
Tuesday Night
Jul 14
|
Clear
|
67°F |
5 to 10 mph
S
|
|
Wednesday
Jul 15
|
Sunny
|
96°F |
0 to 15 mph
S
|
|
Wednesday Night
Jul 15
|
Clear
|
69°F |
5 to 15 mph
S
|
|
Thursday
Jul 16
|
Sunny
|
97°F |
5 to 15 mph
S
|
|
Thursday Night
Jul 16
|
Mostly Clear
|
74°F |
10 to 15 mph
S
|
|
Friday
Jul 17
|
Sunny
|
97°F |
10 to 15 mph
SSW
|
|
Friday Night
Jul 17
|
Mostly Clear
|
74°F |
10 to 15 mph
S
|
|
Saturday
Jul 18
|
Sunny
|
97°F |
10 to 15 mph
S
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
74°F |
10 to 15 mph
S
|
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.
