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Piedmont, California

City in Alameda County, California

Air quality

The air at Piedmont

Index 68, moderate, led by fine particles. Read at 9 PM from its reporting area, Oakland (CA), 3 miles off.

68Moderate
  • Fine particles (PM2.5)68Moderate2.9 mi
  • Ozone28Good19 ppb2.9 mi
  • Nitrogen dioxide18Good19.1 ppb2.9 mi
  • Sulfur dioxide0Good0.4 ppb2.9 mi
  • Carbon monoxide-0.5 ppm2.9 mi

The days ahead

Highest moderate, Sat Oct 17, led by fine particles. Yesterday measured 37, good.

Smoke, the next 44 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 11 or under.

FriSat

Precipitation

What has fallen at Piedmont

None in the last 3 days, to Thu 9 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 Piedmont, the next 44 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Piedmont, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now4 instruments

OaklandOAK

At an airfield/7.3 mi away/7 ft/289 ft below here

temp, wind, gust, visibility, precip, pressure

Rank12of 4,465

measured daily2 instruments

Oakland 4.4 NNWCA-AL-6

In a volunteer observer's own ground/1.1 mi away/191 ft/105 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Oakland, drawn

The nearest airport reporting now, 7.3 mi from Piedmont, California. From its report of Oct 15, 2026, 8:53 PM 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 Oakland, 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 OAKFIG. A THE SKY OVER OAKLANDSECTION, 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 MORE0510TITLEOakland, the skySTATION REPORT · ASOS OAKTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-OAK-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

68.0 F with a dew point of 54.0 F, 61 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,200 ft up.

Chart of the air at Oakland: temperature 68.0 degrees Fahrenheit and dew point 54.0, 61 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,200 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT OAKFIG. B THE AIR AT OAKLANDTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00040 F50 F60 F70 F80 FSATURATES 3,200 FT ABOVE THE STATION, AT 50.8 FTEMPERATURE 68.0 FDEW POINT 54.0 FSPREAD 14.0 FRELATIVE HUMIDITY 61 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 POINTTITLEOakland, the airSTATION REPORT · ASOS OAKTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-OAK-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Oakland, north up: blowing from 340 degrees, the north northwest, 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 OAKFIG. C THE WIND AT OAKLANDPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEOakland, the windSTATION REPORT · ASOS OAKTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-OAK-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Oakland, 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 Piedmont

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

Near Piedmont

River and lake gauges