Harman US

Chelsea, SD Weather & Growing Conditions

This Afternoon
67°F
Chance Rain Showers
A chance of rain showers. Cloudy. High near 67, with temperatures falling to around 63 in the afternoon. Northeast wind around 14 mph. Chance of precipitation is 30%.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 67°F Chance Rain Showers 14 mph NE 27%
Tonight 58°F Slight Chance Rain Showers then Mostly Cloudy 7 to 14 mph NE 23%
Sunday 63°F Cloudy then Chance Rain Showers 13 mph NE 37%
Sunday Night 50°F Chance Rain Showers 6 to 12 mph ENE 46%
Monday 63°F Slight Chance Rain Showers then Mostly Cloudy 8 mph E 21%
Monday Night 43°F Mostly Cloudy 7 mph SE 2%
Tuesday 66°F Mostly Sunny 6 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 Showers And Thunderstorms Likely 17 mph SSE 61%
Thursday 72°F Showers And Thunderstorms Likely 9 to 14 mph SSE 59%
Thursday Night 53°F Mostly Cloudy 6 to 9 mph SE 9%
Friday 74°F Partly Sunny 6 to 14 mph SE 9%
Friday Night 57°F Mostly Cloudy then Slight Chance Rain Showers 15 mph SSE 23%

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 20, 2026.