Irwin, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irwin, a community in Lancaster County, South Carolina.
Tonight
70°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then patchy fog. Mostly cloudy, with a low around 70. Northeast wind around 1 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Chance Showers And Thunderstorms | 1 mph NE | 52% |
| Saturday | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 1 to 5 mph NE | 31% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph NE | 22% |
| Sunday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 mph E | 16% |
| Sunday Night | 69°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 16% |
| Monday | 92°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 mph E | 49% |
| Monday Night | 69°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 2 mph E | 67% |
| Tuesday | 85°F | Showers And Thunderstorms Likely | 1 to 6 mph NE | 63% |
| Tuesday Night | 66°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 to 8 mph NE | 63% |
| Wednesday | 79°F | Chance Rain Showers | 8 to 13 mph NE | 35% |
| Wednesday Night | 63°F | Chance Showers And Thunderstorms | 6 to 13 mph NE | 35% |
| Thursday | 80°F | Partly Sunny | 10 mph NE | 10% |
| Thursday Night | 61°F | Partly Cloudy | 3 to 9 mph NE | 10% |
| Friday | 80°F | Mostly Sunny | 6 to 9 mph N | 10% |
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
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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 Sep 19, 2026.