Johnston, SC Weather & Growing Conditions
Today
80°F
Patchy Fog then Mostly Cloudy
Patchy fog between 7am and 9am. Mostly cloudy, with a high near 80. Southeast wind 7 to 12 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Patchy Fog then Mostly Cloudy | 7 to 12 mph SE | 10% |
| Tonight | 64°F | Chance Light Rain | 5 to 10 mph SE | 51% |
| Thursday | 79°F | Patchy Fog then Slight Chance Light Rain | 3 to 7 mph SW | 20% |
| Thursday Night | 62°F | Mostly Cloudy then Chance Light Rain | 2 mph S | 45% |
| Friday | 77°F | Chance Light Rain | 2 to 7 mph SW | 53% |
| Friday Night | 52°F | Mostly Clear | 5 mph NW | 6% |
| Saturday | 72°F | Sunny | 7 mph N | 1% |
| Saturday Night | 44°F | Partly Cloudy | 5 mph NE | 1% |
| Sunday | 68°F | Mostly Sunny | 5 mph NE | 2% |
| Sunday Night | 42°F | Mostly Clear | 3 mph N | 2% |
| Monday | 68°F | Sunny | 5 mph N | 1% |
| Monday Night | 41°F | Mostly Clear | 2 mph W | 2% |
| Tuesday | 70°F | Sunny | 1 to 6 mph W | 4% |
| Tuesday Night | 43°F | Mostly Clear | 3 mph W | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Johnston, SC
Last spring frost
Mar 26
First fall frost
Nov 8
Growing season
228 days
Hardiness zone
8a
Explore more for Johnston, SC: full frost dates · planting calendar · South Carolina frost dates
Climate data from the nearest NOAA station, Johnston 4 Sw, Sc (5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.