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.
Tonight
66°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 66. South wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for South Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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 | 67°F | Showers And Thunderstorms Likely | 13 mph E | 72% |
| Wednesday Night | 52°F | Showers And Thunderstorms Likely | 12 mph E | 72% |
| Thursday | 68°F | Chance Rain Showers then Mostly Cloudy | 9 mph E | 47% |
| Thursday Night | 50°F | Mostly Cloudy | 7 mph NE | 10% |
| Friday | 70°F | Mostly Sunny | 6 to 9 mph NE | 11% |
| Friday Night | 49°F | Partly Cloudy | 5 to 9 mph N | 11% |
| Saturday | 72°F | Mostly Sunny | 8 mph NE | 4% |
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 20, 2026.