Barnwell, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Barnwell, a city in Barnwell County, South Carolina.
Today
91°F
Areas Of Fog then Chance Showers And Thunderstorms
Areas of fog before 10am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 91. South wind around 2 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Barnwell
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 91°F | Areas Of Fog then Chance Showers And Thunderstorms | 2 mph S | 26% |
| Tonight | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph S | 43% |
| Wednesday | 91°F | Patchy Fog then Chance Showers And Thunderstorms | 0 to 5 mph S | 36% |
| Wednesday Night | 71°F | Chance Showers And Thunderstorms | 0 to 3 mph S | 41% |
| Thursday | 92°F | Mostly Sunny then Showers And Thunderstorms Likely | 0 to 3 mph S | 59% |
| Thursday Night | 71°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 mph E | 59% |
| Friday | 93°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 40% |
| Friday Night | 71°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 3 mph E | 40% |
| Saturday | 93°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 3 mph E | 41% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph SE | 41% |
| Sunday | 93°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 1 mph SW | 42% |
| Sunday Night | 72°F | Chance Showers And Thunderstorms | 1 mph S | 42% |
| Monday | 94°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 mph W | 31% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 1 mph W | 31% |
Forecast source: National Weather Service (api.weather.gov) for Barnwell (33.242, -81.366). Updated through the day.
Growing snapshot for Barnwell
Last spring frost
Mar 22
First fall frost
Nov 9
Growing season
233 days
Hardiness zone
8b
More local growing data for Barnwell: nearby ZIP 29812 weather · frost dates · planting calendar · South Carolina frost dates
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Climate data from the nearest NOAA station, Barnwell 5 Ene, Sc (9 mi from Barnwell). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.