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Sierra Madre, California

City in Los Angeles County, California

Air quality

The air at Sierra Madre

Index 23, good, led by ozone. Read at 11 PM from its reporting area, W San Gabriel Vly (CA), 5 miles off.

23Good
  • Fine particles (PM2.5)-11.4 mi
  • Ozone23Good26 ppb4.8 mi
  • Coarse particles (PM10)-11.4 mi
  • Nitrogen dioxide13Good14.1 ppb4.8 mi
  • Sulfur dioxide0Good0.5 ppb12 mi
  • Carbon monoxide-1.1 ppm12 mi

The days ahead

Good each day through Fri Oct 16, led by nitrogen dioxide. Yesterday measured 45, good.

Smoke, the next 43 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 17 or under.

FriSat

Precipitation

What has fallen at Sierra Madre

None in the last 3 days, to Thu 10 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 Sierra Madre, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Sierra Madre, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.5 miles away.

measured now4 instruments

Sierra Madre 2N - Eaton FireRWPC1

At a river or reservoir gauge/2.1 mi away/4,019 ft/3,106 ft above here

temp, wind, gust, humidity, pressure

Rank-

measured daily2 instruments

Mt. Wilson CbsMWSC1

At a cooperative observer's station/4.7 mi away/5,472 ft/4,559 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Mount Wilson, drawn

The nearest airport reporting now, 4.8 mi from Sierra Madre, California. From its report of Oct 15, 2026, 10:20 PM local time: 3 of its 5 sheets.

The air

59.0 F with a dew point of 32.0 F, 36 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 6,100 ft up.

Chart of the air at Mount Wilson: temperature 59.0 degrees Fahrenheit and dew point 32.0, 36 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 6,100 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MWSFIG. B THE AIR AT MOUNT WILSONTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,0008,00020 F30 F40 F50 F60 F70 FSATURATES 6,100 FT ABOVE THE STATION, AT 26.4 FTEMPERATURE 59.0 FDEW POINT 32.0 FSPREAD 27.0 FRELATIVE HUMIDITY 36 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 POINTTITLEMount Wilson, the airSTATION REPORT · ASOS MWSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-MWS-1DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 8 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 14 mph.

Plan of the wind at Mount Wilson, north up: blowing from 310 degrees, the northwest, at 8 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MWSFIG. C THE WIND AT MOUNT WILSONPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 8 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMount Wilson, the windSTATION REPORT · ASOS MWSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-MWS-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The column

At 5,705 ft above sea level, 19 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 24.25 inHg and the temperature at 38.7 F; it reports 59.0 F, 20.3 F warmer than standard.

Section from sea level of where Mount Wilson stands in the atmosphere, height to scale: the station 5,705 feet above sea level with 19 per cent of the air below it; the standard atmosphere's pressure there, 24.25 inches of mercury, and temperature, 38.7 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MWSFIG. D WHERE MOUNT WILSON STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREMOUNT WILSON19 PER CENT OF THE AIR BELOW IT5,705 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE24.25 inHgSTANDARD TEMPERATURE HERE38.7 FTEMPERATURE, REPORTED59.0 FTITLEMount Wilson, the columnSTATION REPORT · ASOS MWSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-MWS-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Mount Wilson, in 5 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Mt. Wilson Cbs (MWSC1), 4.7 miles from here, read 12 Oct, 23:59. measured daily

Elsewhere in California

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

Near Sierra Madre

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

Near Sierra Madre

River and lake gauges