Barnwell, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Barnwell, a city in Barnwell County, South Carolina.
Tonight
61°F
Partly Cloudy
Partly cloudy, with a low around 61. East wind around 5 mph.
7-day forecast for Barnwell
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Partly Cloudy | 5 mph E | 2% |
| Wednesday | 83°F | Patchy Fog then Partly Sunny | 3 to 9 mph SE | 4% |
| Wednesday Night | 64°F | Mostly Cloudy then Chance Light Rain | 0 to 7 mph SE | 31% |
| Thursday | 83°F | Slight Chance Light Rain then Chance Showers And Thunderstorms | 0 to 3 mph S | 31% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 1 mph S | 45% |
| Friday | 80°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 54% |
| Friday Night | 53°F | Slight Chance Light Rain | 2 mph NW | 24% |
| Saturday | 78°F | Mostly Sunny | 3 mph N | 8% |
| Saturday Night | 47°F | Partly Cloudy | 1 mph N | 5% |
| Sunday | 73°F | Mostly Sunny | 2 mph N | 6% |
| Sunday Night | 44°F | Partly Cloudy | 1 mph NW | 11% |
| Monday | 71°F | Sunny then Slight Chance Light Rain | 5 mph NW | 15% |
| Monday Night | 40°F | Slight Chance Light Rain | 2 mph N | 15% |
| Tuesday | 72°F | Sunny | 1 to 6 mph W | 4% |
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 Nov 4, 2026.