Stephan, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Stephan, a community in Hyde County, South Dakota.
This Afternoon
46°F
Mostly Cloudy
Mostly cloudy, with a high near 46. North northwest wind 20 to 23 mph, with gusts as high as 43 mph.
7-day forecast for Stephan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 46°F | Mostly Cloudy | 20 to 23 mph NNW | 6% |
| Tonight | 34°F | Cloudy | 16 mph NNW | 7% |
| Wednesday | 46°F | Chance Light Rain | 15 to 18 mph NW | 25% |
| Wednesday Night | 33°F | Mostly Cloudy | 12 to 15 mph NNW | 9% |
| Thursday | 48°F | Mostly Sunny | 7 to 12 mph N | 0% |
| Thursday Night | 27°F | Partly Cloudy | 6 mph E | 0% |
| Friday | 47°F | Mostly Sunny | 5 to 8 mph SSE | 0% |
| Friday Night | 30°F | Partly Cloudy | 5 mph SSW | 0% |
| Saturday | 58°F | Mostly Sunny | 5 to 13 mph W | 5% |
| Saturday Night | 34°F | Mostly Clear | 5 to 8 mph W | 1% |
| Sunday | 58°F | Sunny | 5 to 10 mph S | 0% |
| Sunday Night | 38°F | Mostly Clear | 10 mph SSW | 0% |
| Monday | 59°F | Sunny | 8 to 16 mph NW | 0% |
| Monday Night | 36°F | Partly Cloudy | 7 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Stephan (44.249, -99.457). Updated through the day.
Growing snapshot for Stephan
Last spring frost
May 10
First fall frost
Sep 29
Growing season
140 days
Hardiness zone
4b
More local growing data for Stephan: nearby ZIP 57346 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Stephan 2 Nw, Sd (1.3 mi from Stephan). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.