Portsmouth, Ohio Weather
Sun climbs to its northern throne. Day 88 of spring. Read this microseason across nine climate regions →
Portsmouth weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——72°54°—
- TuesdayJun 16Overcast——79°56°+7°
- WednesdayJun 17Light Drizzle19%—85°57°+6°
- ThursdayJun 18Showers67%0.32″79°63°-6°
- FridayJun 19Overcast63%—78°58°-1°
- SaturdayJun 20Overcast——77°50°-1°
- SundayJun 21Light Showers24%0.14″81°60°+4°
AQI 31 (Good), driven by PM2.5. AQI down 8 over the last 6 hours (gradual decline). PM2.5 at 5.4 µg/m³ (AQI 30) with a 0.98 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 5.4 µg/m³ (AQI 30) with a 0.98 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.98
- Wind
- calm
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:08 AM
- Moonset
- 9:12 PM
- In sign
- ♊︎ Gemini
Sun climbs to its northern throne
Portsmouth at a glance
- Today vs. normal: 20°F below the seasonal normal for this latitude
- Last frost: April 9 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Portsmouth
- Mon72°54°0%
- Tue79°56°4%
- Wed85°57°19%
- Thu79°63°67%
- Fri78°58°63%
- Sat77°50°2%
- Sun81°60°24%
- Mon76°58°44%
- Tue82°53°36%
- Wed90°57°19%
- Thu90°64°13%
- Fri87°67°29%
- Sat91°63°32%
- Sun89°68°32%
- Mon96°72°24%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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 Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3MRGLMarginal Risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
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