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.
Tonight
71°F
Chance Showers And Thunderstorms then Patchy Fog
A chance of showers and thunderstorms before 10pm, then patchy fog. Partly cloudy, with a low around 71. North wind around 2 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for South Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 71°F | Chance Showers And Thunderstorms then Patchy Fog | 2 mph N | 29% |
| Saturday | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph NE | 44% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 5 mph NE | 53% |
| Sunday | 87°F | Patchy Fog then Chance Showers And Thunderstorms | 3 mph ENE | 46% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph NNE | 40% |
| Monday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 mph SSW | 47% |
| Monday Night | 68°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 mph ENE | 61% |
| Tuesday | 82°F | Showers And Thunderstorms Likely | 6 mph ENE | 65% |
| Tuesday Night | 66°F | Showers And Thunderstorms Likely | 6 to 9 mph NE | 65% |
| Wednesday | 77°F | Chance Rain Showers | 10 mph ENE | 45% |
| Wednesday Night | 62°F | Chance Showers And Thunderstorms | 12 mph NE | 45% |
| Thursday | 78°F | Partly Sunny | 9 mph ENE | 11% |
| Thursday Night | 61°F | Partly Cloudy | 6 mph NE | 9% |
| Friday | 78°F | Mostly Sunny | 5 mph ENE | 11% |
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
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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 Sep 19, 2026.