Mount Vernon, SD Weather & Growing Conditions
Today
67°F
Patchy Drizzle then Cloudy
Patchy drizzle and patchy fog before 11am. Cloudy, with a high near 67. North wind 10 to 15 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 67°F | Patchy Drizzle then Cloudy | 10 to 15 mph N | 12% |
| Tonight | 55°F | Cloudy | 10 to 15 mph NNE | 8% |
| Sunday | 65°F | Cloudy then Chance Rain Showers | 10 to 15 mph NE | 32% |
| Sunday Night | 51°F | Rain Showers | 10 to 15 mph ENE | 75% |
| Monday | 62°F | Rain Showers | 10 mph E | 75% |
| Monday Night | 46°F | Mostly Cloudy | 5 to 10 mph ESE | 5% |
| Tuesday | 66°F | Partly Sunny | 5 to 15 mph SE | 4% |
| Tuesday Night | 48°F | Partly Cloudy | 10 to 15 mph SE | 5% |
| Wednesday | 69°F | Partly Sunny then Slight Chance Rain Showers | 15 to 20 mph SSE | 15% |
| Wednesday Night | 52°F | Chance Rain Showers | 15 mph SSE | 38% |
| Thursday | 71°F | Chance Showers And Thunderstorms | 15 mph SSE | 38% |
| Thursday Night | 54°F | Slight Chance Rain Showers | 10 to 15 mph SE | 16% |
| Friday | 73°F | Slight Chance Rain Showers then Partly Sunny | 10 to 15 mph SE | 16% |
| Friday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph SE | 19% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mount Vernon, SD
Last spring frost
Apr 27
First fall frost
Oct 11
Growing season
167 days
Hardiness zone
5a
Explore more for Mount Vernon, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Mitchell, Sd (10.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.