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South San Jose Hills, California

Community in Los Angeles County, California

Air quality

The air at South San Jose Hills

Index 29, good, led by ozone. Read at 9 AM from its reporting area, E San Gabriel Vly (CA), 8 miles off.

29Good
  • Fine particles (PM2.5)23Good-
  • Ozone29Good-
  • Coarse particles (PM10)23Good-

The days ahead

Moderate each day through Today, led by ozone. Yesterday measured 38, good.

Smoke, the next 44 hours

Little smoke near the ground through Tue 5 AM: the index from smoke stays at 6 or under.

SunMonTue

Precipitation

What has fallen at South San Jose Hills

None in the last 3 days, to Sun 9 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 South San Jose Hills, the next 44 hours

Mist or haze: visibility falls to 3 miles Tue 5 AM.

SunMonTue

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

What is measuring near here

The 6 instruments nearest South San Jose Hills, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.2 miles away.

measured now4 instruments

El MonteEMT

At an airfield/8.9 mi away/295 ft/120 ft below here

temp, wind, gust, visibility, precip, pressure

Rank4,183of 4,465

measured daily2 instruments

La Puente 1.3 ENECA-LA-69

In a volunteer observer's own ground/2.2 mi away/382 ft/33 ft below here

precip, snowfall, snow depth

Rank-

Covina YardCTFC1

At a cooperative observer's station/5.7 mi away/594 ft/179 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at El Monte, drawn

The nearest airport reporting now, 8.9 mi from South San Jose Hills, California. From its report of Oct 18, 2026, 9:45 AM local time: 3 of its 6 sheets.

The sky

Clear; visibility 10 mi or more.

Section of the sky over El Monte, height above the station to scale: a clear sky, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT EMTFIG. A THE SKY OVER EL MONTESECTION, 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 STATIONCLEARVISIBILITY, MILES: 10 MI OR MORE0510TITLEEl Monte, the skySTATION REPORT · ASOS EMTTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-18IDSR-EMT-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

75.2 F with a dew point of 42.8 F, 31 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 7,400 ft up.

Chart of the air at El Monte: temperature 75.2 degrees Fahrenheit and dew point 42.8, 31 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 7,400 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT EMTFIG. B THE AIR AT EL MONTETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00020 F40 F60 F80 FSATURATES 7,400 FT ABOVE THE STATION, AT 35.9 FTEMPERATURE 75.2 FDEW POINT 42.8 FSPREAD 32.4 FRELATIVE HUMIDITY 31 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 POINTTITLEEl Monte, the airSTATION REPORT · ASOS EMTTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-18IDSR-EMT-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at El Monte, 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 EMTFIG. C THE WIND AT EL MONTEPLAN, 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 FORCE73TITLEEl Monte, the windSTATION REPORT · ASOS EMTTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-18IDSR-EMT-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of El Monte, 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 South San Jose Hills

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

Near South San Jose Hills

River and lake gauges