South Mount Vernon, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Mount Vernon, a community in Knox County, Ohio.
Today
65°F
Rain
Rain after 7am. Cloudy, with a high near 65. South wind 10 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for South Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 65°F | Rain | 10 to 15 mph S | 97% |
| Tonight | 52°F | Light Rain | 7 to 14 mph S | 79% |
| Thursday | 63°F | Mostly Sunny | 7 to 14 mph SW | 0% |
| Thursday Night | 44°F | Partly Cloudy | 3 to 8 mph SW | 6% |
| Friday | 57°F | Chance Rain Showers | 3 to 9 mph W | 51% |
| Friday Night | 38°F | Chance Rain Showers | 9 mph NW | 51% |
| Saturday | 50°F | Slight Chance Rain Showers | 10 mph NW | 16% |
| Saturday Night | 32°F | Mostly Cloudy | 7 mph W | 10% |
| Sunday | 54°F | Mostly Sunny | 5 to 12 mph W | 3% |
| Sunday Night | 32°F | Mostly Clear | 8 mph W | 3% |
| Monday | 57°F | Sunny | 6 to 9 mph W | 4% |
| Monday Night | 35°F | Mostly Clear | 8 mph SW | 4% |
| Tuesday | 61°F | Sunny | 8 to 12 mph W | 3% |
| Tuesday Night | 35°F | Mostly Clear | 3 to 7 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov) for South Mount Vernon (40.382, -82.502). Updated through the day.
Growing snapshot for South Mount Vernon
Last spring frost
May 1
First fall frost
Oct 10
Growing season
161 days
Hardiness zone
6a
More local growing data for South Mount Vernon: nearby ZIP 43050 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Fredericktown 4 S, Oh (3.6 mi from South Mount Vernon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.