Portsmouth, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portsmouth, a city in Scioto County, Ohio.
Overnight
59°F
Slight Chance Light Rain
A slight chance of rain. Cloudy, with a low around 59. Southeast wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Portsmouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Slight Chance Light Rain | 6 mph SE | 21% |
| Wednesday | 69°F | Rain | 5 to 9 mph SE | 100% |
| Wednesday Night | 54°F | Light Rain then Mostly Cloudy | 2 to 8 mph SW | 86% |
| Thursday | 68°F | Mostly Sunny | 2 to 7 mph SW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 2 mph SW | 0% |
| Friday | 65°F | Mostly Sunny | 0 to 6 mph W | 11% |
| Friday Night | 40°F | Mostly Cloudy | 5 mph NW | 11% |
| Saturday | 56°F | Mostly Sunny | 6 mph NW | 2% |
| Saturday Night | 35°F | Partly Cloudy | 3 mph NW | 0% |
| Sunday | 59°F | Mostly Sunny | 1 to 6 mph W | 2% |
| Sunday Night | 33°F | Mostly Clear | 3 mph W | 3% |
| Monday | 61°F | Sunny | 5 mph W | 3% |
| Monday Night | 35°F | Mostly Clear | 2 mph SW | 2% |
| Tuesday | 66°F | Sunny | 2 to 6 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Portsmouth (38.753, -82.949). Updated through the day.
Growing snapshot for Portsmouth
Last spring frost
Apr 17
First fall frost
Oct 25
Growing season
191 days
Hardiness zone
7a
More local growing data for Portsmouth: nearby ZIP 45662 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Clarktown
Franklin Furnace
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Lucasville
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New Boston
Otway
Rarden
Rosemount
Sciotodale
South Webster
Wheelersburg
Climate data from the nearest NOAA station, Portsmouth-Sciotoville, Oh (2.8 mi from Portsmouth). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.