Portsmouth, Ohio Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Portsmouth weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast14%—95°75°—
- SundayJul 5Overcast40%—95°74°0°
- MondayJul 6T-storm w/ Hail40%—89°70°-6°
- TuesdayJul 7Overcast24%—89°65°0°
- WednesdayJul 8Overcast18%—94°65°+5°
- ThursdayJul 9Overcast44%—94°67°0°
- FridayJul 10Thunderstorm51%0.04″80°69°-14°
AQI 48 (Good), driven by Ozone. AQI down 5 over the last 6 hours (gradual decline). Ozone at AQI 88. Overcast through the UV peak window (cloud cover ~83%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 8 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 88. Overcast through the UV peak window (cloud cover ~83%) — afternoon ozone should stay flat.
- Present
- AQI 88
- UV peak
- 5.7 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 33
PM × Wind × Precip
PM2.5 at 10.2 µg/m³ (AQI 53) with a 0.90 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.90
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:24 PM
- Moonset
- 10:38 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Portsmouth at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: April 9 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 45662
16-Day Forecast — Portsmouth
- Sat95°75°14%
- Sun95°74°40%
- Mon89°70°40%
- Tue89°65°24%
- Wed94°65°18%
- Thu94°67°44%
- Fri80°69°51%
- Sat90°68°32%
- Sun84°64°25%
- Mon74°57°15%
- Tue83°59°11%
- Wed89°63°25%
- Thu94°70°25%
- Fri95°69°17%
- Sat81°69°26%
- Sun94°70°23%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Portsmouth
SPC has placed Portsmouth in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Portsmouth
- 45662