Harman US

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

WhenTempForecastWindPrecip
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

All South Dakota locations ›

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.