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
84°F
Sunny
Sunny, with a high near 84. East wind around 3 mph.
7-day forecast for South Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Sunny | 3 mph E | 0% |
| Tonight | 62°F | Mostly Clear | 3 mph NE | 0% |
| Wednesday | 86°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph S | 46% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms | 5 mph S | 31% |
| Thursday | 86°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 8 mph SW | 46% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 to 7 mph SW | 59% |
| Friday | 83°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 to 8 mph SW | 73% |
| Friday Night | 64°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 7 mph SW | 73% |
| Saturday | 83°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 35% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 35% |
| Sunday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 18% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 9 mph SW | 28% |
| Monday | 86°F | Chance Rain Showers | 10 mph SW | 33% |
| Monday Night | 67°F | Chance Showers And Thunderstorms | 9 mph SW | 40% |
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 Aug 4, 2026.