Erwin, SD Weather & Growing Conditions
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 30 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 47°F | Chance Rain Showers | 20 mph NNW | 48% |
| Tonight | 35°F | Rain Showers | 15 to 20 mph NNW | 90% |
| Wednesday | 43°F | Rain Showers | 15 to 20 mph NW | 92% |
| Wednesday Night | 32°F | Chance Rain Showers then Mostly Cloudy | 15 mph NNW | 38% |
| Thursday | 44°F | Partly Sunny | 10 to 15 mph N | 3% |
| Thursday Night | 28°F | Mostly Cloudy | 0 to 10 mph NE | 0% |
| Friday | 45°F | Partly Sunny | 0 to 5 mph SSE | 0% |
| Friday Night | 29°F | Partly Cloudy | 5 mph SSW | 0% |
| Saturday | 54°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). Updated through the day.
Growing snapshot for Erwin, SD
Last spring frost
May 5
First fall frost
Oct 4
Growing season
151 days
Hardiness zone
4b
Explore more for Erwin, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, De Smet, Sd (11.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.