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
93°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny, with a high near 93. North northwest wind around 1 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 | 93°F | Chance Showers And Thunderstorms | 1 mph NNW | 29% |
| Tonight | 69°F | Showers And Thunderstorms Likely | 1 mph NNE | 56% |
| Saturday | 88°F | Patchy Fog then Chance Showers And Thunderstorms | 3 mph NE | 32% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 0 to 3 mph NE | 40% |
| Sunday | 86°F | Patchy Fog then Chance Showers And Thunderstorms | 1 mph ESE | 27% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 24% |
| Monday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 mph ESE | 43% |
| Monday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 1 mph ENE | 69% |
| Tuesday | 81°F | Showers And Thunderstorms Likely | 0 to 5 mph NE | 64% |
| Tuesday Night | 65°F | Showers And Thunderstorms Likely | 5 mph NE | 64% |
| Wednesday | 76°F | Chance Rain Showers | 5 to 8 mph NE | 34% |
| Wednesday Night | 61°F | Chance Showers And Thunderstorms | 7 mph NNE | 34% |
| Thursday | 76°F | Slight Chance Rain Showers then Partly Sunny | 6 mph NNE | 15% |
| Thursday Night | 60°F | Partly Cloudy | 5 mph NNE | 9% |
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
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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 Sep 19, 2026.