Stephan, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Stephan, a community in Hyde County, South Dakota.
Overnight
49°F
Mostly Cloudy
Mostly cloudy. Low around 49, with temperatures rising to around 52 overnight. West northwest wind around 7 mph.
7-day forecast for Stephan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Mostly Cloudy | 7 mph WNW | 5% |
| Tuesday | 70°F | Patchy Smoke then Partly Sunny | 2 to 12 mph NW | 5% |
| Tuesday Night | 55°F | Partly Cloudy | 7 mph SW | 0% |
| Wednesday | 79°F | Mostly Sunny | 5 to 12 mph SSW | 0% |
| Wednesday Night | 60°F | Partly Cloudy | 9 to 13 mph S | 4% |
| Thursday | 87°F | Sunny | 8 to 14 mph S | 5% |
| Thursday Night | 64°F | Mostly Clear | 10 mph S | 5% |
| Friday | 90°F | Sunny | 7 to 10 mph WSW | 4% |
| Friday Night | 65°F | Mostly Clear | 10 mph ESE | 4% |
| Saturday | 92°F | Sunny | 9 to 18 mph ESE | 5% |
| Saturday Night | 64°F | Mostly Clear | 10 to 16 mph E | 9% |
| Sunday | 88°F | Mostly Sunny | 12 to 17 mph E | 6% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms | 16 mph E | 34% |
| Monday | 87°F | Chance Showers And Thunderstorms then Partly Sunny | 16 mph ENE | 34% |
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 Aug 4, 2026.