Harman US

Chelsea, SD Weather & Growing Conditions

Today
67°F
Patchy Fog then Cloudy
Patchy fog before 11am. Cloudy. High near 67, with temperatures falling to around 64 in the afternoon. North northeast wind 8 to 13 mph, with gusts as high as 22 mph.

7-day forecast

WhenTempForecastWindPrecip
Today 67°F Patchy Fog then Cloudy 8 to 13 mph NNE 2%
Tonight 52°F Mostly Cloudy then Slight Chance Rain Showers 7 to 13 mph NE 15%
Sunday 67°F Cloudy then Slight Chance Rain Showers 14 mph NE 15%
Sunday Night 49°F Chance Rain Showers 6 to 12 mph ENE 25%
Monday 66°F Chance Rain Showers then Mostly Cloudy 8 mph E 25%
Monday Night 45°F Partly Cloudy 7 mph SE 6%
Tuesday 68°F Mostly Sunny 6 to 16 mph SE 3%
Tuesday Night 48°F Partly Cloudy 14 mph SSE 5%
Wednesday 71°F Partly Sunny then Slight Chance Rain Showers 15 to 20 mph SSE 17%
Wednesday Night 52°F Chance Rain Showers 13 to 16 mph SSE 35%
Thursday 73°F Chance Rain Showers 14 mph SSE 35%
Thursday Night 53°F Slight Chance Rain Showers 12 mph SE 19%
Friday 75°F Slight Chance Rain Showers then Partly Sunny 12 to 16 mph SSE 19%
Friday Night 55°F Mostly Cloudy then Slight Chance Rain Showers 15 mph SSE 21%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Chelsea, SD

Last spring frost
May 11
First fall frost
Sep 27
Growing season
137 days
Hardiness zone
4a

Explore more for Chelsea, SD: full frost dates · planting calendar · South Dakota frost dates

Climate data from the nearest NOAA station, Mellette 4 W, Sd (4.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.