Port Jefferson, OH Weather & Growing Conditions
Today
66°F
Light Rain
Rain before 7am, then rain and a slight chance of thunderstorms. Cloudy, with a high near 66. South wind 16 to 21 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Light Rain | 16 to 21 mph S | 99% |
| Tonight | 49°F | Light Rain Likely then Mostly Cloudy | 7 to 14 mph SW | 73% |
| Thursday | 61°F | Partly Sunny | 8 to 16 mph SW | 1% |
| Thursday Night | 44°F | Mostly Cloudy then Slight Chance Light Rain | 2 to 8 mph SW | 16% |
| Friday | 55°F | Chance Light Rain | 2 to 12 mph W | 44% |
| Friday Night | 36°F | Chance Light Rain then Mostly Cloudy | 6 to 10 mph NW | 44% |
| Saturday | 52°F | Partly Sunny | 9 mph NW | 4% |
| Saturday Night | 32°F | Partly Cloudy | 2 to 6 mph W | 4% |
| Sunday | 56°F | Sunny | 2 to 13 mph W | 4% |
| Sunday Night | 32°F | Mostly Clear | 3 to 8 mph W | 4% |
| Monday | 58°F | Sunny | 3 to 9 mph W | 3% |
| Monday Night | 36°F | Mostly Clear | 7 mph SW | 2% |
| Tuesday | 62°F | Sunny | 6 to 9 mph W | 1% |
| Tuesday Night | 36°F | Mostly Clear | 1 to 6 mph NW | 1% |
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 (8.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.