Whitehorse, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Whitehorse, a community in Dewey County, South Dakota.
This Afternoon
43°F
Cloudy
Cloudy. High near 43, with temperatures falling to around 34 in the afternoon. North northwest wind around 13 mph.
7-day forecast for Whitehorse
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 43°F | Cloudy | 13 mph NNW | 0% |
| Tonight | 31°F | Mostly Cloudy | 8 to 12 mph NNW | 0% |
| Wednesday | 52°F | Mostly Cloudy | 10 to 17 mph NNW | 0% |
| Wednesday Night | 31°F | Mostly Cloudy | 7 to 13 mph NNW | 0% |
| Thursday | 50°F | Mostly Sunny | 7 mph NNE | 0% |
| Thursday Night | 28°F | Partly Cloudy | 5 mph SE | 0% |
| Friday | 51°F | Mostly Sunny | 6 mph SSW | 0% |
| Friday Night | 31°F | Partly Cloudy | 6 mph SW | 3% |
| Saturday | 60°F | Sunny | 7 to 18 mph W | 3% |
| Saturday Night | 33°F | Mostly Clear | 5 to 8 mph W | 1% |
| Sunday | 62°F | Sunny | 5 to 10 mph SSW | 0% |
| Sunday Night | 38°F | Mostly Clear | 9 mph WSW | 0% |
| Monday | 61°F | Sunny | 7 to 16 mph NW | 0% |
| Monday Night | 34°F | Partly Cloudy | 6 mph W | 1% |
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 Nov 4, 2026.