Mount Vernon, SD Weather & Growing Conditions
Today
72°F
Partly Sunny
Partly sunny, with a high near 72. Northwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Partly Sunny | 5 to 10 mph NW | 12% |
| Tonight | 53°F | Partly Cloudy | 5 mph SW | 2% |
| Wednesday | 79°F | Mostly Sunny | 5 to 10 mph SSW | 1% |
| Wednesday Night | 59°F | Mostly Clear | 10 to 15 mph S | 1% |
| Thursday | 86°F | Mostly Sunny | 10 to 20 mph S | 6% |
| Thursday Night | 64°F | Mostly Clear | 15 mph S | 6% |
| Friday | 90°F | Sunny | 10 to 15 mph SSW | 6% |
| Friday Night | 65°F | Mostly Clear | 10 mph SSE | 8% |
| Saturday | 93°F | Sunny | 10 to 20 mph SSE | 4% |
| Saturday Night | 67°F | Mostly Clear | 15 to 20 mph SE | 8% |
| Sunday | 90°F | Mostly Sunny | 10 to 15 mph ESE | 5% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms | 15 mph E | 21% |
| Monday | 89°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 15 mph ENE | 21% |
| Monday Night | 66°F | Slight Chance Showers And Thunderstorms | 15 mph ENE | 16% |
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 Aug 4, 2026.