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Portsmouth, Ohio

City in Scioto County, Ohio

Air quality

The air at Portsmouth

Index 54, moderate, led by fine particles. Read at 11 AM from its reporting area, Ashland (KY), 26 miles off.

54Moderate
  • Fine particles (PM2.5)54Moderate-
  • Ozone32Good31 ppb19.3 mi

The days ahead

Yesterday measured 34, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 8 AM.

FriSatSun

Precipitation

What has fallen at Portsmouth

None in the last 24 hours; 0.33 in over the last 3 days, to Fri 10 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.33in

Visibility

How far you can see at Portsmouth, the next 45 hours

Visibility stays 8 miles or more through Sun 8 AM, lowest 9 miles Sat 3 AM.

FriSatSun

On the radar over Portsmouth, OhioReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Portsmouth, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now4 instruments

measured daily2 instruments

Portsmouth 1.8 WSWOH-SC-16

In a volunteer observer's own ground/0.3 mi away/559 ft/10 ft below here

precip, snowfall, snow depth

Rank-

SciotovilleSCIO1

At a cooperative observer's station/4.9 mi away/545 ft/24 ft below here

snowfall, snow depth, precip, high, low

Rank21of 1,590

Station report

The weather at Portsmouth, drawn

The nearest airport reporting now, 9.6 mi from Portsmouth, Ohio. From its report of Oct 16, 2026, 11:15 AM local time: 3 of its 6 sheets.

The sky

Overcast at 2,300 ft; the ceiling is 2,300 ft; visibility 10 mi or more.

Section of the sky over Portsmouth, height above the station to scale: overcast cloud with its base at 2,300 feet, the ceiling at 2,300 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT PMHFIG. A THE SKY OVER PORTSMOUTHSECTION, HEIGHT ABOVE THE STATION TO SCALE, EACH LAYER AT THE HEIGHT OF ITS BASE AS REPORTED; COVER IN EIGHTHS OF THE SKY; TOPS NOT MEASUREDFT ABOVE THE STATION05001,0001,5002,0002,5003,0003,500ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,300 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 2,300 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEPortsmouth, the skySTATION REPORT · ASOS PMHTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-PMH-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

68.0 F with a dew point of 64.4 F, 88 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up; the lowest cloud reported is at 2,300 ft.

Chart of the air at Portsmouth: temperature 68.0 degrees Fahrenheit and dew point 64.4, 88 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 800 feet above the station, against the lowest cloud reported at 2,300 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT PMHFIG. B THE AIR AT PORTSMOUTHTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 F80 FSATURATES 800 FT ABOVE THE STATION, AT 63.5 FLOWEST CLOUD REPORTED, OVC 2,300 FTTEMPERATURE 68.0 FDEW POINT 64.4 FSPREAD 3.6 FRELATIVE HUMIDITY 88 PER CENTTHE AIR COOLS ABOUT 5.4 F EACH 1,000 FT IT RISES, AND ITS DEW POINT ABOUT 1 FSOLID: THE LIFTED AIR'S TEMPERATURE; DASHED: ITS DEW POINTTITLEPortsmouth, the airSTATION REPORT · ASOS PMHTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-PMH-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 13 mph, gusting 20 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 24 mph.

Plan of the wind at Portsmouth, north up: blowing from 310 degrees, the northwest, at 13 miles an hour, gusting 20; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT PMHFIG. C THE WIND AT PORTSMOUTHPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 13 MPH5FRESH BREEZE19GUST, 20 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEPortsmouth, the windSTATION REPORT · ASOS PMHTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-PMH-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Portsmouth, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Sciotoville (SCIO1), 4.9 miles from here, read 16 Oct, 07:00. measured daily

Elsewhere in Ohio

24 places, each with its own forecast and its own instruments.

Near Portsmouth

The nearest places, each with its own forecast and the instruments nearest it.

Near Portsmouth

River and lake gauges