Smithfield, NC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithfield, a town in Johnston County, North Carolina.
Tonight
70°F
Showers And Thunderstorms Likely then Mostly Cloudy
Showers and thunderstorms likely before midnight. Mostly cloudy, with a low around 70. North wind around 2 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Smithfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Showers And Thunderstorms Likely then Mostly Cloudy | 2 mph N | 72% |
| Saturday | 84°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph NE | 30% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 6 mph NE | 36% |
| Sunday | 88°F | Mostly Sunny | 2 mph E | 10% |
| Sunday Night | 70°F | Mostly Clear | 1 mph S | 7% |
| Monday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 3 mph NE | 54% |
| Monday Night | 69°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 mph NE | 59% |
| Tuesday | 84°F | Showers And Thunderstorms Likely | 2 to 8 mph NE | 62% |
| Tuesday Night | 66°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 to 10 mph NE | 62% |
| Wednesday | 78°F | Chance Rain Showers then Chance Showers And Thunderstorms | 14 mph NE | 34% |
| Wednesday Night | 63°F | Chance Showers And Thunderstorms then Mostly Cloudy | 7 to 14 mph N | 34% |
| Thursday | 77°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 13 mph N | 17% |
| Thursday Night | 60°F | Slight Chance Showers And Thunderstorms | 5 to 12 mph N | 17% |
| Friday | 77°F | Slight Chance Rain Showers then Partly Sunny | 9 mph N | 15% |
Forecast source: National Weather Service (api.weather.gov) for Smithfield (35.524, -78.352). Updated through the day.
Growing snapshot for Smithfield
Last spring frost
Mar 29
First fall frost
Nov 5
Growing season
220 days
Hardiness zone
8a
More local growing data for Smithfield: nearby ZIP 27577 weather · frost dates · planting calendar · North Carolina frost dates
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Climate data from the nearest NOAA station, Smithfield, Nc (1.7 mi from Smithfield). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.