Erwin, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Erwin, a town in Kingsbury County, South Dakota.
Overnight
55°F
Patchy Smoke
Patchy smoke. Partly cloudy, with a low around 55. North northwest wind around 10 mph.
7-day forecast for Erwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Patchy Smoke | 10 mph NNW | 0% |
| Tuesday | 70°F | Mostly Sunny | 10 mph NW | 3% |
| Tuesday Night | 53°F | Mostly Clear | 5 mph WSW | 1% |
| Wednesday | 76°F | Sunny | 5 to 15 mph SSW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 10 to 15 mph SSW | 0% |
| Thursday | 81°F | Sunny | 15 mph SSW | 4% |
| Thursday Night | 63°F | Mostly Clear | 10 to 15 mph S | 4% |
| Friday | 84°F | Sunny | 10 to 15 mph SSW | 7% |
| Friday Night | 63°F | Mostly Clear | 5 to 10 mph SSE | 7% |
| Saturday | 85°F | Sunny | 10 to 15 mph SSE | 5% |
| Saturday Night | 65°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph ESE | 18% |
| Sunday | 83°F | Mostly Sunny | 15 mph E | 12% |
| Sunday Night | 64°F | Slight Chance Showers And Thunderstorms | 15 mph E | 24% |
| Monday | 80°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 15 mph ENE | 24% |
Forecast source: National Weather Service (api.weather.gov) for Erwin (44.488, -97.441). Updated through the day.
Growing snapshot for Erwin
Last spring frost
May 5
First fall frost
Oct 4
Growing season
151 days
Hardiness zone
4b
More local growing data for Erwin: nearby ZIP 57233 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, De Smet, Sd (11.5 mi from Erwin). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.