Harman US

Chelsea, SD Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Chelsea, a town in Spink County, South Dakota.

Tonight
55°F
Patchy Drizzle
Patchy drizzle and patchy fog. Cloudy, with a low around 55. Northeast wind around 10 mph. Chance of precipitation is 20%.

7-day forecast for Chelsea

WhenTempForecastWindPrecip
Tonight 55°F Patchy Drizzle 10 mph NE 22%
Saturday 67°F Patchy Fog 13 mph NE 3%
Saturday Night 53°F Cloudy then Slight Chance Rain Showers 8 to 13 mph NE 20%
Sunday 66°F Chance Rain Showers 10 to 14 mph NE 34%
Sunday Night 50°F Rain Showers Likely 7 to 12 mph ENE 57%
Monday 64°F Rain Showers Likely 9 mph E 57%
Monday Night 47°F Mostly Cloudy 8 mph ESE 10%
Tuesday 67°F Partly Sunny 7 to 14 mph SE 3%
Tuesday Night 50°F Mostly Cloudy then Slight Chance Rain Showers 13 mph SSE 15%
Wednesday 69°F Slight Chance Rain Showers 14 to 18 mph SSE 19%
Wednesday Night 53°F Chance Rain Showers 10 to 15 mph SSE 28%
Thursday 71°F Chance Rain Showers then Partly Sunny 10 mph SSE 28%
Thursday Night 54°F Partly Cloudy 9 mph SE 13%
Friday 73°F Partly Sunny 8 to 15 mph SE 13%

Forecast source: National Weather Service (api.weather.gov) for Chelsea (45.168, -98.743). Updated through the day.

Growing snapshot for Chelsea

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

More local growing data for Chelsea: nearby ZIP 57465 weather · frost dates · planting calendar · South Dakota frost dates

Nearby towns & communities

All South Dakota locations ›

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