Erwin, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Erwin, a town in Kingsbury County, South Dakota.
This Afternoon
47°F
Chance Rain Showers
A chance of rain showers. Cloudy. High near 47, with temperatures falling to around 44 in the afternoon. North northwest wind around 20 mph, with gusts as high as 35 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Erwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 47°F | Chance Rain Showers | 20 mph NNW | 50% |
| Tonight | 35°F | Rain Showers | 15 to 20 mph NNW | 90% |
| Wednesday | 43°F | Rain Showers | 15 to 20 mph NNW | 92% |
| Wednesday Night | 32°F | Chance Rain Showers then Mostly Cloudy | 15 mph NNW | 37% |
| Thursday | 44°F | Partly Sunny | 10 to 15 mph N | 3% |
| Thursday Night | 28°F | Mostly Cloudy | 0 to 10 mph NE | 0% |
| Friday | 44°F | Partly Sunny | 5 mph SSE | 0% |
| Friday Night | 29°F | Partly Cloudy | 5 mph SSW | 0% |
| Saturday | 53°F | Mostly Sunny | 5 to 10 mph WSW | 4% |
| Saturday Night | 33°F | Mostly Clear | 5 to 10 mph W | 4% |
| Sunday | 55°F | Sunny | 5 to 10 mph SW | 2% |
| Sunday Night | 37°F | Mostly Clear | 10 mph SSW | 0% |
| Monday | 57°F | Sunny | 10 to 15 mph W | 0% |
| Monday Night | 35°F | Mostly Clear | 5 to 10 mph WNW | 0% |
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 Nov 3, 2026.