Union, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union, a city in Union County, South Carolina.
This Afternoon
76°F
Chance Light Rain
A chance of rain. Mostly cloudy, with a high near 76. Southeast wind around 3 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Chance Light Rain | 3 mph SE | 34% |
| Tonight | 64°F | Light Rain Likely | 5 mph SSE | 70% |
| Thursday | 76°F | Patchy Fog then Chance Light Rain | 2 to 6 mph SSW | 31% |
| Thursday Night | 60°F | Mostly Cloudy then Slight Chance T-storms | 1 mph WNW | 24% |
| Friday | 74°F | Chance Light Rain | 2 mph W | 35% |
| Friday Night | 50°F | Mostly Clear | 0 to 3 mph NNW | 4% |
| Saturday | 69°F | Sunny | 1 to 5 mph N | 2% |
| Saturday Night | 40°F | Mostly Clear | 2 mph N | 0% |
| Sunday | 67°F | Sunny | 2 mph NW | 0% |
| Sunday Night | 40°F | Mostly Clear | 1 mph NW | 0% |
| Monday | 70°F | Sunny | 1 mph NW | 1% |
| Monday Night | 40°F | Mostly Clear | 0 mph | 3% |
| Tuesday | 69°F | Mostly Sunny | 0 to 5 mph WSW | 6% |
| Tuesday Night | 43°F | Partly Cloudy then Slight Chance Light Rain | 1 mph NNW | 15% |
Forecast source: National Weather Service (api.weather.gov) for Union (34.723, -81.625). Updated through the day.
Growing snapshot for Union
Last spring frost
Apr 4
First fall frost
Nov 1
Growing season
210 days
Hardiness zone
8a
More local growing data for Union: nearby ZIP 29379 weather · frost dates · planting calendar · South Carolina frost dates
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Climate data from the nearest NOAA station, Santuck, Sc (5.9 mi from Union). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.