Port William, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port William, a village in Clinton County, Ohio.
Today
84°F
Mostly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 3pm and 4pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 84. South wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Port William
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 8 mph S | 58% |
| Tonight | 66°F | Showers And Thunderstorms Likely | 7 mph S | 68% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 7 to 10 mph W | 55% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 12 mph N | 63% |
| Monday | 71°F | Chance Rain Showers | 14 mph NE | 36% |
| Monday Night | 54°F | Chance Showers And Thunderstorms | 12 to 16 mph NE | 36% |
| Tuesday | 70°F | Chance Showers And Thunderstorms | 14 mph NE | 34% |
| Tuesday Night | 56°F | Chance Rain Showers | 9 to 15 mph NE | 52% |
| Wednesday | 70°F | Showers And Thunderstorms Likely | 13 mph NE | 58% |
| Wednesday Night | 55°F | Showers And Thunderstorms Likely | 7 to 14 mph NE | 58% |
| Thursday | 70°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 10 mph NE | 21% |
| Thursday Night | 53°F | Mostly Cloudy | 6 to 10 mph NE | 12% |
| Friday | 71°F | Mostly Sunny | 7 to 12 mph NE | 10% |
| Friday Night | 50°F | Partly Cloudy | 6 to 12 mph NE | 10% |
Forecast source: National Weather Service (api.weather.gov) for Port William (39.552, -83.786). Updated through the day.
Growing snapshot for Port William
Last spring frost
Apr 20
First fall frost
Oct 20
Growing season
180 days
More local growing data for Port William: nearby ZIP 45164 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Wilmington 3 N, Oh (4.7 mi from Port William). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.