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Muir Beach, California

Community in Marin County, California

Air quality

The air at Muir Beach

Index 56, moderate, led by fine particles. Read at 8 PM from its reporting area, San Rafael (CA), 8 miles off.

56Moderate
  • Fine particles (PM2.5)56Moderate-
  • Ozone31Good-

The days ahead

Good each day through Tue Oct 20, led by ozone. Yesterday measured 30, good.

Smoke, the next 46 hours

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

ThuFriSat

Precipitation

What has fallen at Muir Beach

None in the last 3 days, to Thu 7 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 Muir Beach, the next 46 hours

Visibility stays 10 miles or more through Sat 5 PM.

ThuFriSat

On the radar over Muir Beach, CaliforniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Muir Beach, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.1 miles away.

measured now3 instruments

NovatoDVO

At an airfield/19.5 mi away/3 ft/218 ft below here

temp, wind, gust, visibility, precip, pressure

Rank32of 4,465

measured daily2 instruments

Muir Beach 0.1 NNWCA-MR-17

In a volunteer observer's own ground/0.1 mi away/417 ft/196 ft above here

precip, snowfall, snow depth

Rank-

Mill Valley - Muir WoodsMUIC1

At a cooperative observer's station/2.6 mi away/850 ft/629 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Novato, drawn

The nearest airport reporting now, 19.5 mi from Muir Beach, California. From its report of Oct 15, 2026, 8:15 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 Novato, 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 DVOFIG. A THE SKY OVER NOVATOSECTION, 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 MORE0510TITLENovato, the skySTATION REPORT · ASOS DVOTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DVO-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

64.4 F with a dew point of 50.0 F, 59 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,300 ft up.

Chart of the air at Novato: temperature 64.4 degrees Fahrenheit and dew point 50.0, 59 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,300 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DVOFIG. B THE AIR AT NOVATOTHE 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 F80 FSATURATES 3,300 FT ABOVE THE STATION, AT 46.8 FTEMPERATURE 64.4 FDEW POINT 50.0 FSPREAD 14.4 FRELATIVE HUMIDITY 59 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 POINTTITLENovato, the airSTATION REPORT · ASOS DVOTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DVO-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Novato, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DVOFIG. C THE WIND AT NOVATOPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLENovato, the windSTATION REPORT · ASOS DVOTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DVO-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in California

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

Near Muir Beach

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

Near Muir Beach

River and lake gauges