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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.