Harman US

Portsmouth, OH Weather & Growing Conditions

This Afternoon
83°F
Mostly Cloudy
Mostly cloudy, with a high near 83. North wind around 6 mph.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 83°F Mostly Cloudy 6 mph N 7%
Tonight 62°F Partly Cloudy then Widespread Fog 2 to 6 mph NE 4%
Saturday 85°F Widespread Fog then Mostly Sunny 2 mph E 5%
Saturday Night 66°F Chance Showers And Thunderstorms 3 mph S 25%
Sunday 86°F Chance Showers And Thunderstorms 5 mph SW 45%
Sunday Night 65°F Chance Showers And Thunderstorms 5 mph N 45%
Monday 80°F Chance Rain Showers then Chance Showers And Thunderstorms 6 mph NE 38%
Monday Night 62°F Chance Showers And Thunderstorms then Showers And Thunderstorms Likely 6 mph NE 58%
Tuesday 76°F Chance Showers And Thunderstorms 6 mph NE 52%
Tuesday Night 61°F Chance Showers And Thunderstorms then Showers And Thunderstorms Likely 6 mph NE 62%
Wednesday 74°F Rain Showers Likely 6 mph NE 62%
Wednesday Night 58°F Showers And Thunderstorms Likely 6 mph NE 56%
Thursday 73°F Slight Chance Rain Showers 6 mph N 18%
Thursday Night 57°F Slight Chance Rain Showers then Mostly Cloudy 2 to 6 mph N 18%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Portsmouth, OH

Last spring frost
Apr 17
First fall frost
Oct 25
Growing season
191 days
Hardiness zone
7a

Explore more for Portsmouth, OH: full frost dates · planting calendar · Ohio frost dates

Climate data from the nearest NOAA station, Portsmouth-Sciotoville, Oh (2.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.