Irwin, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irwin, a community in Lancaster County, South Carolina.
Today
84°F
Patchy Fog then Chance Showers And Thunderstorms
Patchy fog and a slight chance of showers and thunderstorms before 8am, then patchy fog and a chance of showers and thunderstorms between 8am and 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and thunderstorms between 2pm and 5pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 84. Northeast wind 0 to 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Patchy Fog then Chance Showers And Thunderstorms | 0 to 5 mph NE | 77% |
| Tonight | 69°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 mph NE | 62% |
| Wednesday | 87°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 6 mph S | 70% |
| Wednesday Night | 70°F | Showers And Thunderstorms Likely | 0 to 3 mph S | 71% |
| Thursday | 89°F | Partly Sunny then Showers And Thunderstorms Likely | 1 to 6 mph S | 63% |
| Thursday Night | 70°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph S | 63% |
| Friday | 90°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SW | 32% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 0 to 3 mph S | 32% |
| Saturday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph S | 20% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms | 0 to 3 mph S | 20% |
| Sunday | 91°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 3 mph W | 34% |
| Sunday Night | 72°F | Chance Showers And Thunderstorms | 2 mph W | 34% |
| Monday | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 1 to 5 mph SW | 29% |
| Monday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph W | 29% |
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 Aug 4, 2026.