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San Marcos, California

City in San Diego County, California

Air quality

The air at San Marcos

Index 21, good, led by fine particles. Read at 3 AM from its reporting area, San Diego Mesa and Inland Valley (CA), 21 miles off.

21Good
  • Fine particles (PM2.5)21Good14.1 mi
  • Ozone19Good28 ppb14.1 mi
  • Coarse particles (PM10)13Good14.1 mi

The days ahead

Good each day through Today, led by ozone. Yesterday measured 27, good.

Smoke, the next 45 hours

Little smoke near the ground through Sat 11 PM: the index from smoke stays at 44 or under.

FriSat

Precipitation

What has fallen at San Marcos

None in the last 3 days, to Fri 2 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 San Marcos, the next 45 hours

Visibility stays 10 miles or more through Sat 11 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest San Marcos, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.8 miles away.

measured now4 instruments

measured daily2 instruments

San Marcos 1.7 WCA-SD-135

In a volunteer observer's own ground/1.8 mi away/533 ft/32 ft below here

precip, snowfall, snow depth

Rank-

Escondido No 2ESCC1

At a cooperative observer's station/5.1 mi away/666 ft/101 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Carlsbad/Palomar, drawn

The nearest airport reporting now, 6.2 mi from San Marcos, California. From its report of Oct 16, 2026, 2:53 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 Carlsbad/Palomar, 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 CRQFIG. A THE SKY OVER CARLSBAD/PALOMARSECTION, 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 MORE0510TITLECarlsbad/Palomar, the skySTATION REPORT · ASOS CRQTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-CRQ-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

68.0 F with a dew point of 42.0 F, 39 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,900 ft up.

Chart of the air at Carlsbad/Palomar: temperature 68.0 degrees Fahrenheit and dew point 42.0, 39 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CRQFIG. B THE AIR AT CARLSBAD/PALOMARTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,0008,00030 F40 F50 F60 F70 F80 FSATURATES 5,900 FT ABOVE THE STATION, AT 36.4 FTEMPERATURE 68.0 FDEW POINT 42.0 FSPREAD 26.0 FRELATIVE HUMIDITY 39 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 POINTTITLECarlsbad/Palomar, the airSTATION REPORT · ASOS CRQTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-CRQ-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.

Plan of the wind at Carlsbad/Palomar, 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 CRQFIG. C THE WIND AT CARLSBAD/PALOMARPLAN, 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 FORCE73TITLECarlsbad/Palomar, the windSTATION REPORT · ASOS CRQTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-CRQ-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Carlsbad/Palomar, 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 San Marcos

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

Near San Marcos

River and lake gauges