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Castaic, California

Community in Los Angeles County, California

Air quality

The air at Castaic

Index 34, good, led by ozone. Read at 5 AM from its reporting area, Santa Clarita Vly (CA), 9 miles off.

34Good
  • Fine particles (PM2.5)18Good8.8 mi
  • Ozone34Good39 ppb8.8 mi
  • Coarse particles (PM10)-14.4 mi
  • Nitrogen dioxide1Good1.6 ppb8.8 mi

The days ahead

Good each day through Today, led by ozone. Yesterday measured 42, good.

Smoke, the next 42 hours

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

FriSat

Precipitation

What has fallen at Castaic

None in the last 3 days, to Fri 5 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 Castaic, the next 42 hours

Visibility stays 10 miles or more through Sat 11 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Castaic, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.6 miles away.

measured now4 instruments

measured daily2 instruments

Val Verde 4.1 NNECA-LA-93

In a volunteer observer's own ground/1.6 mi away/1,300 ft/130 ft below here

precip, snowfall, snow depth

Rank-

Piru 2 ESEPRUC1

At a cooperative observer's station/8.9 mi away/737 ft/693 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Sandburg (AUT), drawn

The nearest airport reporting now, 19.2 mi from Castaic, California. From its report of Oct 16, 2026, 5:51 AM 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 Sandburg (AUT), 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 SDBFIG. A THE SKY OVER SANDBURG (AUT)SECTION, 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 MORE0510TITLESandburg (AUT), the skySTATION REPORT · ASOS SDBTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SDB-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

53.0 F with a dew point of 32.0 F, 45 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 4,800 ft up.

Chart of the air at Sandburg (AUT): temperature 53.0 degrees Fahrenheit and dew point 32.0, 45 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 4,800 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SDBFIG. B THE AIR AT SANDBURG (AUT)THE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,00020 F30 F40 F50 F60 FSATURATES 4,800 FT ABOVE THE STATION, AT 27.6 FTEMPERATURE 53.0 FDEW POINT 32.0 FSPREAD 21.0 FRELATIVE HUMIDITY 45 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 POINTTITLESandburg (AUT), the airSTATION REPORT · ASOS SDBTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SDB-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northeast (50 degrees) at 12 mph, gusting 28 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 45 mph.

Plan of the wind at Sandburg (AUT), north up: blowing from 50 degrees, the northeast, at 12 miles an hour, gusting 28; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SDBFIG. C THE WIND AT SANDBURG (AUT)PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 50°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE25GUST, 28 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESandburg (AUT), the windSTATION REPORT · ASOS SDBTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SDB-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Sandburg (AUT), 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 Castaic

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

Near Castaic

River and lake gauges