Barnwell, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Barnwell, a city in Barnwell County, South Carolina.
This Afternoon
94°F
Mostly Sunny
Mostly sunny, with a high near 94. Wind around 0 mph.
7-day forecast for Barnwell
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 94°F | Mostly Sunny | 0 mph | 5% |
| Tonight | 71°F | Mostly Clear then Patchy Fog | 0 mph | 10% |
| Saturday | 93°F | Patchy Fog then Chance Showers And Thunderstorms | 2 mph NE | 40% |
| Saturday Night | 72°F | Chance Showers And Thunderstorms | 2 mph E | 32% |
| Sunday | 90°F | Partly Sunny then Chance Showers And Thunderstorms | 1 mph NE | 37% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 mph NE | 37% |
| Monday | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 mph E | 43% |
| Monday Night | 71°F | Chance Showers And Thunderstorms | 1 mph SE | 43% |
| Tuesday | 89°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph NE | 54% |
| Tuesday Night | 70°F | Chance Showers And Thunderstorms | 0 to 3 mph NE | 54% |
| Wednesday | 84°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 10 mph NE | 32% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms then Partly Cloudy | 3 to 9 mph NE | 32% |
| Thursday | 83°F | Mostly Sunny | 8 mph NE | 10% |
| Thursday Night | 65°F | Partly Cloudy | 1 to 7 mph NE | 10% |
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
Nearby towns & communities
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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 Sep 18, 2026.