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SeaTac, Washington

City in King County, Washington

Air quality

The air at SeaTac

Index 64, moderate, led by fine particles. Read at 11 AM from its reporting area, Seattle-Bellevue-Kent Valley (WA), 9 miles off.

64Moderate
  • Fine particles (PM2.5)64Moderate6.4 mi
  • Ozone4Good4 ppb8.9 mi
  • Coarse particles (PM10)35Good8.6 mi
  • Nitrogen dioxide19Good20 ppb8.6 mi
  • Sulfur dioxide1Good1.2 ppb8.9 mi
  • Carbon monoxide-0.5 ppm8.9 mi

The days ahead

Good each day through Wed Oct 21, led by fine particles. Yesterday measured 53, moderate.

Smoke, the next 43 hours

Little smoke near the ground through Sun 5 AM: the index from smoke stays at 28 or under.

FriSatSun

Precipitation

What has fallen at SeaTac

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

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

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

Visibility stays 4 miles or more through Sun 5 AM, lowest 4 miles Sat 3 AM.

FriSatSun

On the radar over SeaTac, WashingtonReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest SeaTac, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.2 miles away.

measured now4 instruments

measured daily2 instruments

Tacoma No. 1TACW1

At a cooperative observer's station/14.7 mi away/6 ft/419 ft below here

snowfall, snow depth, precip, high, low

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Station report

The weather at Seattle-Tacoma INTL, drawn

The nearest airport reporting now, 1.2 mi from SeaTac, Washington. From its report of Oct 16, 2026, 10:53 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 500 ft, a few clouds at 21,000 ft, broken at 25,000 ft; the ceiling is 25,000 ft; visibility 10 mi or more.

Section of the sky over Seattle-Tacoma INTL, height above the station to scale: a few clouds cloud with its base at 500 feet, a few clouds cloud with its base at 21,000 feet, broken cloud with its base at 25,000 feet, the ceiling at 25,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SEAFIG. A THE SKY OVER SEATTLE-TACOMA INTLSECTION, 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 STATION05,00010,00015,00020,00025,00030,00035,00040,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTBKN 25,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 21,000 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYFEW 500 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 25,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLESeattle-Tacoma INTL, the skySTATION REPORT · ASOS SEATYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SEA-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014, FB-SKY-010, FB-SKY-011, FB-SKY-012

The air

57.0 F with a dew point of 53.0 F, 86 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up; the lowest cloud reported is at 500 ft.

Chart of the air at Seattle-Tacoma INTL: temperature 57.0 degrees Fahrenheit and dew point 53.0, 86 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 900 feet above the station, against the lowest cloud reported at 500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SEAFIG. B THE AIR AT SEATTLE-TACOMA INTLTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 900 FT ABOVE THE STATION, AT 52.0 FLOWEST CLOUD REPORTED, FEW 500 FTTEMPERATURE 57.0 FDEW POINT 53.0 FSPREAD 4.0 FRELATIVE HUMIDITY 86 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 POINTTITLESeattle-Tacoma INTL, the airSTATION REPORT · ASOS SEATYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SEA-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southeast (150 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Seattle-Tacoma INTL, north up: blowing from 150 degrees, the south southeast, 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 SEAFIG. C THE WIND AT SEATTLE-TACOMA INTLPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 150°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESeattle-Tacoma INTL, the windSTATION REPORT · ASOS SEATYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SEA-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Seattle-Tacoma INTL, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Washington

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

Near SeaTac

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

Near SeaTac

River and lake gauges