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Gresham, Oregon

City in Multnomah County, Oregon

Air quality

The air at Gresham

Index 31, good, led by ozone. Read at 9 PM from its reporting area, Clackamas (OR), 9 miles off.

31Good
  • Fine particles (PM2.5)28Good7.9 mi
  • Ozone31Good39 ppb7.9 mi
  • Nitrogen dioxide2Good2 ppb7.9 mi
  • Sulfur dioxide0Good0 ppb7.9 mi
  • Carbon monoxide-0.1 ppm7.9 mi

The days ahead

Yesterday measured 22, good.

Smoke, the next 44 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 44 or under.

FriSat

Precipitation

What has fallen at Gresham

None in the last 3 days, to Thu 8 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 Gresham, the next 44 hours

Visibility stays 5 miles or more through Sat 5 PM, lowest 6 miles Sat 8 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Gresham, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.

measured now4 instruments

measured daily2 instruments

TroutdaleTRTO3

At a cooperative observer's station/4.3 mi away/26 ft/326 ft below here

snowfall, snow depth, precip, high, low

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Station report

The weather at Portland - Troutdale, drawn

The nearest airport reporting now, 3.6 mi from Gresham, Oregon. From its report of Oct 15, 2026, 8:53 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 - Troutdale, 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 TTDFIG. A THE SKY OVER PORTLAND - TROUTDALESECTION, 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 - Troutdale, the skySTATION REPORT · ASOS TTDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-TTD-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

69.0 F with a dew point of 40.0 F, 35 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 6,600 ft up.

Chart of the air at Portland - Troutdale: temperature 69.0 degrees Fahrenheit and dew point 40.0, 35 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 6,600 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TTDFIG. B THE AIR AT PORTLAND - TROUTDALETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00020 F30 F40 F50 F60 F70 F80 FSATURATES 6,600 FT ABOVE THE STATION, AT 33.9 FTEMPERATURE 69.0 FDEW POINT 40.0 FSPREAD 29.0 FRELATIVE HUMIDITY 35 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 - Troutdale, the airSTATION REPORT · ASOS TTDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-TTD-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east (90 degrees) at 18 mph, gusting 25 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 38 mph.

Plan of the wind at Portland - Troutdale, north up: blowing from 90 degrees, the east, at 18 miles an hour, gusting 25; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TTDFIG. C THE WIND AT PORTLAND - TROUTDALEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 90°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 18 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 25 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEPortland - Troutdale, the windSTATION REPORT · ASOS TTDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-TTD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Portland - Troutdale, 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 Gresham

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

Near Gresham

River and lake gauges