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Forest Grove, Oregon

City in Washington County, Oregon

Air quality

The air at Forest Grove

Index 37, good, led by fine particles. Read at 3 PM from its reporting area, Hillsboro (OR), 7 miles off.

37Good
  • Fine particles (PM2.5)37Good6.7 mi
  • Ozone-45 ppb19.8 mi
  • Nitrogen dioxide5Good5 ppb19.8 mi
  • Sulfur dioxide0Good0 ppb24.7 mi
  • Carbon monoxide-0.3 ppm19.8 mi

The days ahead

Yesterday measured 26, good.

Smoke, the next 45 hours

Little smoke near the ground through Sun 11 AM: the index from smoke stays at 17 or under.

FriSatSun

Precipitation

What has fallen at Forest Grove

None in the last 3 days, to Fri 2 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 Forest Grove, the next 45 hours

Visibility stays 10 miles or more through Sun 11 AM.

FriSatSun

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

What is measuring near here

The 6 instruments nearest Forest Grove, 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

Forest GroveFOGO3

At a cooperative observer's station/0.3 mi away/174 ft/13 ft below here

snowfall, snow depth, precip, high, low

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Station report

The weather at Portland/Hillsboro, drawn

The nearest airport reporting now, 7.7 mi from Forest Grove, Oregon. From its report of Oct 16, 2026, 2:53 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

79.0 F with a dew point of 41.0 F, 26 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 8,600 ft up.

Chart of the air at Portland/Hillsboro: temperature 79.0 degrees Fahrenheit and dew point 41.0, 26 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 8,600 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 F40 F60 F80 FSATURATES 8,600 FT ABOVE THE STATION, AT 33.1 FTEMPERATURE 79.0 FDEW POINT 41.0 FSPREAD 38.0 FRELATIVE HUMIDITY 26 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 south (190 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Portland/Hillsboro, north up: blowing from 190 degrees, the south, at 3 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, 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 190°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE 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 Forest Grove

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

Near Forest Grove

River and lake gauges