Port Jefferson, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Jefferson, a village in Shelby County, Ohio.
Today
81°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of rain showers between noon and 2pm, then a chance of showers and thunderstorms between 2pm and 3pm, then showers and thunderstorms likely between 3pm and 5pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Southeast wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Port Jefferson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Mostly Cloudy then Chance Showers And Thunderstorms | 7 mph SE | 61% |
| Tonight | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 mph S | 58% |
| Sunday | 80°F | Showers And Thunderstorms Likely | 5 to 12 mph W | 68% |
| Sunday Night | 56°F | Showers And Thunderstorms Likely | 14 mph NE | 67% |
| Monday | 68°F | Chance Rain Showers | 15 mph NE | 53% |
| Monday Night | 52°F | Chance Rain Showers | 12 to 17 mph NE | 50% |
| Tuesday | 68°F | Mostly Cloudy | 12 to 16 mph NE | 14% |
| Tuesday Night | 54°F | Chance Rain Showers | 10 to 16 mph NE | 51% |
| Wednesday | 68°F | Chance Showers And Thunderstorms | 12 mph NE | 51% |
| Wednesday Night | 54°F | Chance Rain Showers | 6 to 12 mph NE | 51% |
| Thursday | 69°F | Mostly Cloudy | 6 to 9 mph NE | 14% |
| Thursday Night | 52°F | Mostly Cloudy | 5 to 9 mph N | 14% |
| Friday | 70°F | Mostly Sunny | 5 to 12 mph NE | 11% |
| Friday Night | 50°F | Partly Cloudy | 5 to 12 mph NE | 11% |
Forecast source: National Weather Service (api.weather.gov) for Port Jefferson (40.331, -84.092). Updated through the day.
Growing snapshot for Port Jefferson
Last spring frost
Apr 27
First fall frost
Oct 20
Growing season
175 days
Hardiness zone
6a
More local growing data for Port Jefferson: nearby ZIP 45360 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Sidney 1 S, Oh (5.1 mi from Port Jefferson). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.