Chelsea, SD Weather & Growing Conditions
Tonight
36°F
Chance Light Rain
A chance of rain. Cloudy. Low around 36, with temperatures rising to around 39 overnight. North northwest wind 13 to 21 mph, with gusts as high as 30 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 36°F | Chance Light Rain | 13 to 21 mph NNW | 41% |
| Wednesday | 46°F | Chance Light Rain | 15 to 18 mph NNW | 52% |
| Wednesday Night | 30°F | Mostly Cloudy | 12 to 15 mph NNW | 10% |
| Thursday | 43°F | Partly Sunny | 8 to 14 mph N | 0% |
| Thursday Night | 24°F | Mostly Cloudy | 2 to 7 mph E | 0% |
| Friday | 44°F | Partly Sunny | 2 to 6 mph S | 0% |
| Friday Night | 25°F | Partly Cloudy | 6 mph S | 0% |
| Saturday | 57°F | Mostly Sunny | 6 to 12 mph WSW | 3% |
| Saturday Night | 30°F | Mostly Clear | 8 mph W | 1% |
| Sunday | 57°F | Sunny | 6 to 9 mph SSW | 1% |
| Sunday Night | 34°F | Mostly Clear | 9 mph SSW | 0% |
| Monday | 59°F | Sunny | 8 to 15 mph WNW | 0% |
| Monday Night | 32°F | Mostly Clear | 5 to 8 mph WNW | 0% |
| Tuesday | 54°F | Mostly Sunny | 5 to 8 mph WSW | 0% |
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 Nov 4, 2026.