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
82°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 2pm, then showers and thunderstorms between 2pm and 3pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 82. Northeast wind around 3 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 82°F | Chance Showers And Thunderstorms | 3 mph NE | 83% |
| Tonight | 67°F | Chance Showers And Thunderstorms | 2 mph NNE | 57% |
| Wednesday | 84°F | Showers And Thunderstorms Likely | 0 to 3 mph SSE | 74% |
| Wednesday Night | 68°F | Showers And Thunderstorms Likely | 2 mph SSE | 64% |
| Thursday | 86°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SSW | 59% |
| Thursday Night | 69°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 mph W | 56% |
| Friday | 87°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 3 mph W | 33% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 2 mph W | 35% |
| Saturday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 mph SSW | 26% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 1 mph W | 26% |
| Sunday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 2 mph WSW | 30% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 1 mph WNW | 30% |
| Monday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 3 mph W | 24% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph WNW | 24% |
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
Nearby towns & communities
All South Carolina locations ›
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 Aug 4, 2026.