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Cornelius, Oregon

City in Washington County, Oregon

Air quality

The air at Cornelius

Index 28, good, led by fine particles. Read at 10 PM from its reporting area, Hillsboro (OR), 4 miles off.

28Good
  • Fine particles (PM2.5)28Good3.8 mi
  • Ozone-38 ppb17 mi
  • Nitrogen dioxide2Good2 ppb17 mi
  • Sulfur dioxide0Good0 ppb21.7 mi
  • Carbon monoxide-0.2 ppm17 mi

The days ahead

Yesterday measured 22, good.

Smoke, the next 43 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 17 or under.

FriSat

Precipitation

What has fallen at Cornelius

None in the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at Cornelius, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

On the radar over Cornelius, OregonReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Cornelius, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.1 miles away.

measured now4 instruments

measured daily2 instruments

Forest GroveFOGO3

At a cooperative observer's station/2.4 mi away/174 ft/7 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Portland/Hillsboro, drawn

The nearest airport reporting now, 5.2 mi from Cornelius, Oregon. From its report of Oct 15, 2026, 9:53 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Portland/Hillsboro, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HIOFIG. A THE SKY OVER PORTLAND/HILLSBOROSECTION, 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEPortland/Hillsboro, the skySTATION REPORT · ASOS HIOTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-HIO-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

70.0 F with a dew point of 37.0 F, 30 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 7,500 ft up.

Chart of the air at Portland/Hillsboro: temperature 70.0 degrees Fahrenheit and dew point 37.0, 30 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 7,500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HIOFIG. B THE AIR AT PORTLAND/HILLSBOROTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00020 F30 F40 F50 F60 F70 F80 FSATURATES 7,500 FT ABOVE THE STATION, AT 30.1 FTEMPERATURE 70.0 FDEW POINT 37.0 FSPREAD 33.0 FRELATIVE HUMIDITY 30 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 POINTTITLEPortland/Hillsboro, the airSTATION REPORT · ASOS HIOTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-HIO-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east (80 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 31 mph.

Plan of the wind at Portland/Hillsboro, north up: blowing from 80 degrees, the east, at 6 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HIOFIG. C THE WIND AT PORTLAND/HILLSBOROPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 80°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEPortland/Hillsboro, the windSTATION REPORT · ASOS HIOTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-HIO-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Oregon

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

Near Cornelius

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

Near Cornelius

River and lake gauges