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
83°F
Showers And Thunderstorms
A chance of rain showers before 11am, then showers and thunderstorms between 11am and 5pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 83. East wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for South Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Showers And Thunderstorms | 6 mph E | 79% |
| Tonight | 68°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph NE | 57% |
| Wednesday | 83°F | Chance Showers And Thunderstorms | 5 mph ESE | 76% |
| Wednesday Night | 69°F | Showers And Thunderstorms Likely | 2 mph E | 71% |
| Thursday | 86°F | Chance Showers And Thunderstorms | 1 to 5 mph S | 70% |
| Thursday Night | 69°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 3 mph WNW | 65% |
| Friday | 86°F | Chance Showers And Thunderstorms | 0 to 3 mph SE | 52% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 2 mph ESE | 51% |
| Saturday | 87°F | Chance Showers And Thunderstorms | 0 to 3 mph WSW | 39% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 2 mph NW | 39% |
| Sunday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 3 mph WSW | 32% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 2 mph WNW | 32% |
| Monday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph WSW | 36% |
| Monday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 3 mph WSW | 36% |
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 Aug 4, 2026.