Chelsea, SD Weather & Growing Conditions
Today
76°F
Mostly Sunny
Mostly sunny, with a high near 76. West northwest wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Mostly Sunny | 9 mph WNW | 0% |
| Tonight | 53°F | Mostly Clear | 5 to 8 mph SW | 0% |
| Wednesday | 83°F | Mostly Sunny | 6 to 13 mph SW | 1% |
| Wednesday Night | 59°F | Partly Cloudy | 12 mph SSW | 3% |
| Thursday | 88°F | Sunny | 13 mph SSW | 10% |
| Thursday Night | 61°F | Mostly Clear | 10 mph S | 10% |
| Friday | 89°F | Sunny | 8 to 12 mph W | 2% |
| Friday Night | 61°F | Mostly Clear | 7 to 12 mph ESE | 3% |
| Saturday | 88°F | Sunny | 8 to 16 mph E | 6% |
| Saturday Night | 61°F | Mostly Clear | 10 to 15 mph ENE | 10% |
| Sunday | 86°F | Mostly Sunny | 9 to 15 mph ENE | 5% |
| Sunday Night | 62°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph ENE | 26% |
| Monday | 84°F | Chance Showers And Thunderstorms then Partly Sunny | 10 to 16 mph NE | 26% |
| Monday Night | 61°F | Slight Chance Showers And Thunderstorms | 10 to 16 mph NE | 20% |
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 Aug 4, 2026.