Irwin, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irwin, a community in Lancaster County, South Carolina.
This Afternoon
79°F
Mostly Sunny
Mostly sunny, with a high near 79. East wind around 7 mph.
7-day forecast for Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Mostly Sunny | 7 mph E | 0% |
| Tonight | 55°F | Mostly Clear | 5 mph E | 1% |
| Wednesday | 80°F | Partly Sunny | 3 to 9 mph SE | 3% |
| Wednesday Night | 63°F | Chance Light Rain | 2 to 6 mph SE | 45% |
| Thursday | 79°F | Chance Light Rain then Chance Showers And Thunderstorms | 2 to 6 mph S | 38% |
| Thursday Night | 63°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 1 mph S | 56% |
| Friday | 77°F | Showers And Thunderstorms Likely | 1 to 5 mph SW | 61% |
| Friday Night | 52°F | Slight Chance T-storms | 0 to 3 mph NW | 19% |
| Saturday | 73°F | Mostly Sunny | 1 to 6 mph N | 7% |
| Saturday Night | 45°F | Partly Cloudy | 3 mph NE | 5% |
| Sunday | 68°F | Mostly Sunny | 3 mph NW | 6% |
| Sunday Night | 42°F | Mostly Clear | 3 mph NW | 13% |
| Monday | 67°F | Sunny | 3 to 7 mph NW | 13% |
| Monday Night | 39°F | Slight Chance Light Rain | 3 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Irwin (34.694, -80.822). Updated through the day.
Growing snapshot for Irwin
Last spring frost
Mar 31
First fall frost
Nov 5
Growing season
220 days
Hardiness zone
8a
More local growing data for Irwin: nearby ZIP 29720 weather · frost dates · planting calendar · South Carolina frost dates
Nearby towns & communities
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Climate data from the nearest NOAA station, Monroe Ap, Nc (20 mi from Irwin). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.