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.

Today
65°F
Mostly Cloudy
Mostly cloudy, with a high near 65. Northeast wind around 14 mph.

7-day forecast for Stephan

WhenTempForecastWindPrecip
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

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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.