Mount Vernon, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Vernon, a city in Davison County, South Dakota.
Tonight
36°F
Chance Rain Showers
A chance of rain showers. 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 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 36°F | Chance Rain Showers | 15 to 20 mph NW | 46% |
| Wednesday | 46°F | Rain Showers | 15 to 20 mph NW | 77% |
| Wednesday Night | 34°F | Chance Rain Showers then Mostly Cloudy | 15 mph NW | 29% |
| Thursday | 47°F | Partly Sunny | 10 to 15 mph NNW | 4% |
| Thursday Night | 28°F | Partly Cloudy | 0 to 10 mph NE | 0% |
| Friday | 48°F | Mostly Sunny | 0 to 5 mph SE | 0% |
| Friday Night | 29°F | Partly Cloudy | 5 mph SSW | 0% |
| Saturday | 58°F | Sunny | 5 to 10 mph WSW | 4% |
| 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 | 59°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Mount Vernon (43.713, -98.261). Updated through the day.
Growing snapshot for Mount Vernon
Last spring frost
Apr 27
First fall frost
Oct 11
Growing season
167 days
Hardiness zone
5a
More local growing data for Mount Vernon: nearby ZIP 57363 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mitchell, Sd (10.9 mi from Mount Vernon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.