Mount Vernon, SD Weather & Growing Conditions
Tonight
36°F
Cloudy then Chance Rain Showers
A chance of rain showers after 3am. Cloudy. Low around 36, with temperatures rising to around 39 overnight. Northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 36°F | Cloudy then Chance Rain Showers | 15 to 20 mph NW | 30% |
| Wednesday | 46°F | Rain Showers Likely | 15 to 20 mph NW | 66% |
| Wednesday Night | 34°F | Mostly Cloudy | 15 mph NW | 13% |
| Thursday | 45°F | Mostly Cloudy | 10 to 15 mph N | 0% |
| Thursday Night | 28°F | Mostly Cloudy | 0 to 10 mph NE | 0% |
| Friday | 46°F | Mostly Sunny | 0 to 5 mph SE | 0% |
| Friday Night | 28°F | Partly Cloudy | 5 mph S | 0% |
| Saturday | 56°F | Sunny | 5 to 10 mph SW | 0% |
| Saturday Night | 34°F | Mostly Clear | 5 to 10 mph W | 3% |
| Sunday | 60°F | Sunny | 5 to 10 mph SW | 1% |
| Sunday Night | 38°F | Mostly Clear | 10 mph SSW | 0% |
| Monday | 61°F | Sunny | 10 to 15 mph WNW | 0% |
| Monday Night | 36°F | Mostly Clear | 5 to 10 mph WNW | 0% |
| Tuesday | 58°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
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 Nov 4, 2026.