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.

This Afternoon
67°F
Cloudy
Cloudy, with a high near 67. Northeast wind around 13 mph, with gusts as high as 21 mph.

7-day forecast for Chelsea

WhenTempForecastWindPrecip
This Afternoon 67°F Cloudy 13 mph NE 4%
Tonight 58°F Mostly Cloudy 7 to 12 mph NE 4%
Sunday 63°F Cloudy then Chance Rain Showers 13 mph NE 43%
Sunday Night 50°F Chance Rain Showers 6 to 12 mph ENE 44%
Monday 64°F Slight Chance Rain Showers then Mostly Cloudy 8 mph E 22%
Monday Night 43°F Mostly Cloudy 7 mph SE 3%
Tuesday 66°F Mostly Sunny 5 to 14 mph SE 1%
Tuesday Night 48°F Partly Cloudy 14 mph SSE 4%
Wednesday 68°F Partly Sunny 15 to 20 mph SSE 11%
Wednesday Night 52°F Chance Showers And Thunderstorms 17 mph SSE 53%
Thursday 72°F Chance Showers And Thunderstorms then Partly Sunny 9 to 14 mph SSE 53%
Thursday Night 54°F Mostly Cloudy 6 to 9 mph SE 12%
Friday 74°F Partly Sunny 6 to 14 mph SE 10%
Friday Night 57°F Mostly Cloudy then Slight Chance Rain Showers 15 mph SSE 23%

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

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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.