Duncan, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duncan, a town in Spartanburg County, South Carolina.
This Afternoon
95°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 95. Heat index values as high as 101. North wind around 2 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Duncan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 95°F | Slight Chance Showers And Thunderstorms | 2 mph N | 21% |
| Tonight | 70°F | Chance Showers And Thunderstorms | 3 mph NNW | 35% |
| Saturday | 89°F | Patchy Fog then Chance Showers And Thunderstorms | 2 to 6 mph NE | 44% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 2 to 6 mph NE | 47% |
| Sunday | 87°F | Patchy Fog then Chance Showers And Thunderstorms | 2 mph SE | 41% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph W | 36% |
| Monday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 3 mph SSW | 48% |
| Monday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 mph ENE | 69% |
| Tuesday | 80°F | Showers And Thunderstorms Likely | 3 to 7 mph NE | 66% |
| Tuesday Night | 64°F | Showers And Thunderstorms Likely | 8 to 12 mph NE | 66% |
| Wednesday | 75°F | Chance Rain Showers | 14 mph NE | 39% |
| Wednesday Night | 60°F | Chance Showers And Thunderstorms | 14 mph NE | 38% |
| Thursday | 76°F | Slight Chance Rain Showers then Partly Sunny | 12 mph NE | 19% |
| Thursday Night | 60°F | Partly Cloudy | 6 to 9 mph NNE | 12% |
Forecast source: National Weather Service (api.weather.gov) for Duncan (34.929, -82.148). Updated through the day.
Growing snapshot for Duncan
Last spring frost
Mar 28
First fall frost
Nov 7
Growing season
224 days
Hardiness zone
8a
More local growing data for Duncan: nearby ZIP 29334 weather · frost dates · planting calendar · South Carolina frost dates
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Climate data from the nearest NOAA station, Greer, Sc (5.6 mi from Duncan). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.