Union, SC Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Union, SC in one place.
Sunny, with a high near 91. East southeast wind around 1 mph.
Local Weather Overview
This forecast page for Union, SC is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 17, 2026 12:55 AM EDT.
The active forecast window currently covers Sep 17 to Sep 23, 2026 for Union, SC.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 17 to Sep 23, 2026
- Latest sync
- Sep 17, 2026 12:55 AM EDT
- Forecast office
- GSP
- Source
- NOAA / NWS
Daily Outlook
This Week in Union
Friday looks like the warmest upcoming period in Union at 93 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 66 degrees F.
The strongest winds are forecast for Wednesday at about 1 to 5 mph NE.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 17, 2026 12:55 AM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- GSP
- Radar station
- KGSP
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 68. Wind around 0 mph.
A slight chance of showers and thunderstorms after 5pm. Sunny, with a high near 93. North northeast wind around 2 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 68. East northeast wind around 1 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.
Mostly sunny, with a high near 89.
Partly cloudy, with a low around 68.
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 50%.
A slight chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 82.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Sep 17
|
Sunny
|
91°F |
1 mph
ESE
|
|
Thursday Night
Sep 17
|
Mostly Clear
|
68°F |
0 mph
|
|
Friday
Sep 18
|
Sunny then Slight Chance Showers And Thunderstorms
|
93°F |
2 mph
NNE
|
|
Friday Night
Sep 18
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
68°F |
1 mph
ENE
|
|
Saturday
Sep 19
|
Partly Sunny then Chance Showers And Thunderstorms
|
87°F |
0 to 3 mph
NE
|
|
Saturday Night
Sep 19
|
Chance Showers And Thunderstorms
|
67°F |
1 mph
NE
|
|
Sunday
Sep 20
|
Mostly Sunny
|
89°F |
1 mph
SSE
|
|
Sunday Night
Sep 20
|
Partly Cloudy
|
68°F |
0 mph
|
|
Monday
Sep 21
|
Mostly Sunny then Chance Showers And Thunderstorms
|
89°F |
2 mph
SE
|
|
Monday Night
Sep 21
|
Chance Showers And Thunderstorms
|
67°F |
1 mph
ENE
|
|
Tuesday
Sep 22
|
Slight Chance Rain Showers then Chance Showers And Thunderstorms
|
85°F |
0 to 3 mph
NE
|
|
Tuesday Night
Sep 22
|
Chance Showers And Thunderstorms
|
66°F |
2 mph
NE
|
|
Wednesday
Sep 23
|
Chance Rain Showers
|
82°F |
1 to 5 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Union.
Nearby forecast pages are not available for this location yet.