South Union, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Union, a community in Oconee County, South Carolina.
Today
70°F
Chance Light Rain
A slight chance of rain before 9am, then patchy fog and a slight chance of rain between 9am and 10am, then a chance of rain and a slight chance of thunderstorms between 10am and 1pm, then a chance of thunderstorms and a chance of rain. Cloudy, with a high near 70. East southeast wind 2 to 8 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for South Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Chance Light Rain | 2 to 8 mph ESE | 52% |
| Tonight | 63°F | Rain | 2 mph SE | 89% |
| Thursday | 75°F | Areas Of Fog then Chance Light Rain | 1 to 5 mph SSW | 31% |
| Thursday Night | 57°F | Mostly Cloudy then Slight Chance Light Rain | 2 mph SW | 23% |
| Friday | 75°F | Slight Chance Light Rain then Mostly Sunny | 5 mph WSW | 19% |
| Friday Night | 48°F | Clear | 2 to 6 mph NW | 1% |
| Saturday | 69°F | Sunny | 2 mph W | 0% |
| Saturday Night | 44°F | Partly Cloudy | 2 mph NE | 0% |
| Sunday | 66°F | Mostly Sunny | 0 to 5 mph SE | 1% |
| Sunday Night | 42°F | Mostly Clear | 2 mph WNW | 1% |
| Monday | 67°F | Sunny | 3 mph WSW | 1% |
| Monday Night | 42°F | Mostly Clear | 1 mph WNW | 1% |
| Tuesday | 68°F | Sunny | 0 to 5 mph W | 1% |
| Tuesday Night | 43°F | Mostly Clear | 3 mph WNW | 2% |
Forecast source: National Weather Service (api.weather.gov) for South Union (34.560, -83.049). Updated through the day.
Growing snapshot for South Union
Last spring frost
Mar 20
First fall frost
Nov 15
Growing season
241 days
Hardiness zone
8a
More local growing data for South Union: nearby ZIP 29643 weather · frost dates · planting calendar · South Carolina frost dates
Nearby towns & communities
All South Carolina locations ›
Climate data from the nearest NOAA station, Hartwell, Ga (11.1 mi from South Union). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.