Stephan, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Stephan, a community in Hyde County, South Dakota.
Today
65°F
Mostly Cloudy
Mostly cloudy, with a high near 65. Northeast wind around 14 mph.
7-day forecast for Stephan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 65°F | Mostly Cloudy | 14 mph NE | 4% |
| Tonight | 57°F | Slight Chance Rain Showers then Cloudy | 13 mph NE | 17% |
| Sunday | 61°F | Patchy Fog then Rain Showers | 15 mph ENE | 78% |
| Sunday Night | 50°F | Rain Showers | 12 mph ENE | 89% |
| Monday | 60°F | Chance Rain Showers | 12 mph E | 41% |
| Monday Night | 45°F | Mostly Cloudy | 9 mph ESE | 12% |
| Tuesday | 64°F | Partly Sunny | 8 to 16 mph SE | 3% |
| Tuesday Night | 49°F | Mostly Cloudy | 14 to 18 mph SE | 8% |
| Wednesday | 67°F | Partly Sunny then Slight Chance Rain Showers | 18 to 22 mph SSE | 15% |
| Wednesday Night | 53°F | Chance Showers And Thunderstorms | 16 to 20 mph SE | 51% |
| Thursday | 73°F | Chance Showers And Thunderstorms then Partly Sunny | 9 to 16 mph SSE | 45% |
| Thursday Night | 55°F | Mostly Cloudy | 8 mph ESE | 12% |
| Friday | 73°F | Partly Sunny | 8 to 16 mph SE | 10% |
| Friday Night | 57°F | Chance Rain Showers | 16 mph SE | 31% |
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.