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.
This Afternoon
77°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy, with a high near 77. Southeast wind around 6 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for South Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Showers And Thunderstorms Likely | 6 mph SE | 71% |
| Tonight | 66°F | Showers And Thunderstorms Likely | 7 mph S | 69% |
| Sunday | 77°F | Showers And Thunderstorms | 7 mph W | 77% |
| Sunday Night | 54°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 7 to 10 mph NE | 57% |
| Monday | 68°F | Chance Rain Showers | 13 mph NE | 48% |
| Monday Night | 52°F | Slight Chance Rain Showers | 13 mph NE | 18% |
| Tuesday | 68°F | Chance Rain Showers | 13 mph NE | 26% |
| Tuesday Night | 55°F | Showers And Thunderstorms Likely | 13 mph NE | 70% |
| Wednesday | 66°F | Showers And Thunderstorms Likely | 13 mph E | 70% |
| Wednesday Night | 51°F | Showers And Thunderstorms Likely | 8 to 12 mph E | 68% |
| Thursday | 68°F | Chance Rain Showers | 9 mph NE | 31% |
| Thursday Night | 50°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph NE | 17% |
| Friday | 69°F | Mostly Sunny | 9 mph NE | 14% |
| Friday Night | 49°F | Partly Cloudy | 6 to 9 mph NE | 14% |
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 Sep 19, 2026.