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Bryn Mawr-Skyway, Washington

Community in King County, Washington

Air quality

The air at Bryn Mawr-Skyway

Index 28, good, led by ozone. Read at 12 PM from its reporting area, Seattle-Bellevue-Kent Valley (WA), 7 miles off.

28Good
  • Fine particles (PM2.5)25Good6.3 mi
  • Ozone28Good30 ppb6.3 mi
  • Coarse particles (PM10)10Good6.3 mi
  • Nitrogen dioxide3Good3.3 ppb6.3 mi
  • Sulfur dioxide0Good0.5 ppb6.3 mi
  • Carbon monoxide-0.1 ppm6.3 mi

The days ahead

Good each day through Wed Oct 21, led by fine particles. Yesterday measured 57, moderate.

Smoke, the next 42 hours

Little smoke near the ground through Mon 5 AM: the index from smoke stays at 11 or under.

SatSunMon

Precipitation

What has fallen at Bryn Mawr-Skyway

0.07 in in the last 24 hours, and none in the 2 days before, to Sat 11 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.07in
Last 3 days
0.07in

Visibility

How far you can see at Bryn Mawr-Skyway, the next 42 hours

Visibility stays 8 miles or more through Mon 5 AM, lowest 9 miles Sun 8 AM.

SatSunMon

On the radar over Bryn Mawr-Skyway, WashingtonReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Bryn Mawr-Skyway, 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

Renton 1.5 NWWA-KG-174

In a volunteer observer's own ground/1.1 mi away/131 ft/209 ft below here

precip, snowfall, snow depth

Rank-

Seattle WaSEW

At a cooperative observer's station/13.4 mi away/24 ft/316 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Renton Municipal, drawn

The nearest airport reporting now, 1.3 mi from Bryn Mawr-Skyway, Washington. From its report of Oct 17, 2026, 11:53 AM local time: 3 of its 6 sheets.

The sky

Overcast at 3,500 ft; the ceiling is 3,500 ft; visibility 10 mi or more.

Section of the sky over Renton Municipal, height above the station to scale: overcast cloud with its base at 3,500 feet, the ceiling at 3,500 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RNTFIG. A THE SKY OVER RENTON MUNICIPALSECTION, 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,500 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 3,500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLERenton Municipal, the skySTATION REPORT · ASOS RNTTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-RNT-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

60.0 F with a dew point of 51.0 F, 72 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,100 ft up; the lowest cloud reported is at 3,500 ft.

Chart of the air at Renton Municipal: temperature 60.0 degrees Fahrenheit and dew point 51.0, 72 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,100 feet above the station, against the lowest cloud reported at 3,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RNTFIG. B THE AIR AT RENTON MUNICIPALTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00040 F50 F60 F70 FSATURATES 2,100 FT ABOVE THE STATION, AT 49.0 FLOWEST CLOUD REPORTED, OVC 3,500 FTTEMPERATURE 60.0 FDEW POINT 51.0 FSPREAD 9.0 FRELATIVE HUMIDITY 72 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 POINTTITLERenton Municipal, the airSTATION REPORT · ASOS RNTTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-RNT-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

At 3 mph: force 1, a light air on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at Renton Municipal, north up: 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 RNTFIG. C THE WIND AT RENTON MUNICIPALPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONDIRECTION NOT REPORTEDBEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLERenton Municipal, the windSTATION REPORT · ASOS RNTTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-RNT-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Renton Municipal, 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 Bryn Mawr-Skyway

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

Near Bryn Mawr-Skyway

River and lake gauges