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Walnut, California

City in Los Angeles County, California

Air quality

The air at Walnut

Index 43, good, led by ozone. Read at 10 PM from its reporting area, E San Gabriel Vly (CA), 7 miles off.

43Good
  • Fine particles (PM2.5)12Good7.9 mi
  • Ozone43Good45 ppb7.9 mi
  • Coarse particles (PM10)12Good7.9 mi
  • Nitrogen dioxide1Good1.1 ppb7.9 mi
  • Sulfur dioxide0Good0.5 ppb20.6 mi
  • Carbon monoxide-0.3 ppm14.8 mi

The days ahead

Good each day through Fri Oct 16, led by ozone. Yesterday measured 49, 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 Walnut

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 Walnut, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Walnut, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now4 instruments

measured daily2 instruments

Walnut 0.5 SSWCA-LA-120

In a volunteer observer's own ground/0.3 mi away/565 ft/33 ft below here

precip, snowfall, snow depth

Rank-

Covina YardCTFC1

At a cooperative observer's station/4.7 mi away/594 ft/4 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at La Verne/Brackett, drawn

The nearest airport reporting now, 6.6 mi from Walnut, California. From its report of Oct 15, 2026, 8:47 PM local time: 3 of its 6 sheets.

The sky

Clear; visibility 10 mi or more.

Section of the sky over La Verne/Brackett, height above the station to scale: a clear sky, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT POCFIG. A THE SKY OVER LA VERNE/BRACKETTSECTION, 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 MORE0510TITLELa Verne/Brackett, the skySTATION REPORT · ASOS POCTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-POC-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

78.8 F with a dew point of 35.6 F, 21 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 9,700 ft up.

Chart of the air at La Verne/Brackett: temperature 78.8 degrees Fahrenheit and dew point 35.6, 21 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 9,700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT POCFIG. B THE AIR AT LA VERNE/BRACKETTTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00012,00020 F40 F60 F80 FSATURATES 9,700 FT ABOVE THE STATION, AT 26.8 FTEMPERATURE 78.8 FDEW POINT 35.6 FSPREAD 43.2 FRELATIVE HUMIDITY 21 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 POINTTITLELa Verne/Brackett, the airSTATION REPORT · ASOS POCTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-POC-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southwest (200 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 29 mph.

Plan of the wind at La Verne/Brackett, north up: blowing from 200 degrees, the south southwest, at 9 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 POCFIG. C THE WIND AT LA VERNE/BRACKETTPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 200°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLELa Verne/Brackett, the windSTATION REPORT · ASOS POCTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-POC-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of La Verne/Brackett, 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 Walnut

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

Near Walnut

River and lake gauges