Whitehorse, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Whitehorse, a community in Dewey County, South Dakota.
Today
77°F
Patchy Smoke then Sunny
Patchy smoke before 8am. Sunny, with a high near 77. West northwest wind 7 to 10 mph.
7-day forecast for Whitehorse
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Patchy Smoke then Sunny | 7 to 10 mph WNW | 0% |
| Tonight | 54°F | Mostly Clear | 3 to 7 mph SW | 0% |
| Wednesday | 86°F | Mostly Sunny | 2 to 10 mph WSW | 0% |
| Wednesday Night | 60°F | Partly Cloudy | 5 to 8 mph SSW | 2% |
| Thursday | 93°F | Sunny | 5 to 9 mph WSW | 1% |
| Thursday Night | 62°F | Mostly Clear | 5 to 9 mph ENE | 0% |
| Friday | 94°F | Sunny | 5 to 12 mph NNE | 1% |
| Friday Night | 63°F | Mostly Clear | 7 to 12 mph ESE | 1% |
| Saturday | 96°F | Mostly Sunny | 7 to 14 mph NE | 1% |
| Saturday Night | 63°F | Mostly Clear | 7 to 13 mph ENE | 3% |
| Sunday | 92°F | Mostly Sunny | 7 to 16 mph ENE | 7% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms | 9 to 15 mph E | 32% |
| Monday | 90°F | Slight Chance Rain Showers then Mostly Sunny | 9 to 16 mph ENE | 15% |
| Monday Night | 63°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 8 to 16 mph ENE | 33% |
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 Aug 4, 2026.