Port Jefferson, OH Weather & Growing Conditions
Tonight
62°F
Mostly Cloudy then Chance Rain Showers
A chance of rain showers after 3am. Mostly cloudy, with a low around 62. South wind 12 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 62°F | Mostly Cloudy then Chance Rain Showers | 12 to 17 mph S | 54% |
| Wednesday | 68°F | Rain Showers | 16 to 21 mph S | 100% |
| Wednesday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 6 to 14 mph SW | 31% |
| Thursday | 63°F | Mostly Sunny | 7 to 16 mph SW | 0% |
| Thursday Night | 45°F | Mostly Cloudy | 1 to 7 mph SW | 2% |
| Friday | 58°F | Slight Chance Light Rain | 1 to 8 mph W | 20% |
| Friday Night | 38°F | Slight Chance Light Rain | 7 mph NW | 20% |
| Saturday | 54°F | Slight Chance Light Rain | 8 mph NW | 18% |
| Saturday Night | 33°F | Mostly Cloudy | 1 to 5 mph W | 13% |
| Sunday | 56°F | Mostly Sunny then Slight Chance Light Rain | 1 to 12 mph W | 16% |
| Sunday Night | 34°F | Slight Chance Light Rain then Partly Cloudy | 5 to 8 mph W | 16% |
| Monday | 59°F | Slight Chance Light Rain | 5 to 12 mph W | 16% |
| Monday Night | 37°F | Mostly Clear | 9 mph SW | 14% |
| Tuesday | 62°F | Mostly Sunny | 8 to 12 mph W | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Port Jefferson, OH
Last spring frost
Apr 27
First fall frost
Oct 20
Growing season
175 days
Hardiness zone
6a
Explore more for Port Jefferson, OH: full frost dates · planting calendar · Ohio frost dates
Climate data from the nearest NOAA station, Sidney 1 S, Oh (5.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.