Stephan, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Stephan, a community in Hyde County, South Dakota.
Overnight
58°F
Patchy Fog
Patchy fog and a slight chance of drizzle. Cloudy. Low around 58, with temperatures rising to around 62 overnight. North northeast wind around 6 mph.
7-day forecast for Stephan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Patchy Fog | 6 mph NNE | 10% |
| Saturday | 65°F | Patchy Fog then Cloudy | 7 to 13 mph NNE | 8% |
| Saturday Night | 52°F | Mostly Cloudy | 13 mph NE | 14% |
| Sunday | 62°F | Rain Showers Likely | 15 mph ENE | 61% |
| Sunday Night | 49°F | Rain Showers | 13 mph ENE | 86% |
| Monday | 62°F | Rain Showers | 12 mph E | 86% |
| Monday Night | 45°F | Mostly Cloudy | 10 mph ESE | 10% |
| Tuesday | 66°F | Partly Sunny | 10 to 17 mph SE | 8% |
| Tuesday Night | 49°F | Mostly Cloudy | 17 mph SE | 13% |
| Wednesday | 69°F | Slight Chance Rain Showers | 20 mph SSE | 19% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 14 to 17 mph SE | 40% |
| Thursday | 72°F | Chance Rain Showers | 14 mph SE | 32% |
| Thursday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 13 mph SE | 17% |
| Friday | 74°F | Partly Sunny | 13 to 18 mph SE | 12% |
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 Sep 19, 2026.