Whitehorse, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Whitehorse, a community in Dewey County, South Dakota.
Today
67°F
Slight Chance Rain Showers
A slight chance of drizzle before 11am, then a slight chance of rain showers. Cloudy, with a high near 67. Northeast wind around 12 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Whitehorse
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 67°F | Slight Chance Rain Showers | 12 mph NE | 21% |
| Tonight | 58°F | Chance Rain Showers | 7 to 12 mph ENE | 47% |
| Sunday | 59°F | Rain Showers | 10 to 14 mph ENE | 82% |
| Sunday Night | 51°F | Rain Showers Likely | 5 to 10 mph ENE | 69% |
| Monday | 65°F | Mostly Cloudy | 5 to 10 mph E | 12% |
| Monday Night | 47°F | Partly Cloudy | 9 mph SE | 4% |
| Tuesday | 68°F | Mostly Sunny | 9 to 22 mph SE | 1% |
| Tuesday Night | 52°F | Mostly Cloudy | 20 mph SE | 6% |
| Wednesday | 73°F | Partly Sunny then Slight Chance Rain Showers | 18 to 25 mph SE | 24% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 7 to 22 mph SE | 50% |
| Thursday | 79°F | Mostly Sunny | 7 mph SE | 7% |
| Thursday Night | 56°F | Partly Cloudy | 7 mph SE | 7% |
| Friday | 79°F | Partly Sunny | 6 to 20 mph SE | 7% |
| Friday Night | 58°F | Slight Chance Rain Showers | 16 to 20 mph SE | 23% |
Forecast source: National Weather Service (api.weather.gov) for Whitehorse (45.275, -100.901). Updated through the day.
Growing snapshot for Whitehorse
Last spring frost
May 10
First fall frost
Sep 30
Growing season
141 days
Hardiness zone
4b
More local growing data for Whitehorse: nearby ZIP 57661 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Timber Lake, Sd (12.2 mi from Whitehorse). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.