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Brentwood, California

City in Contra Costa County, California

Air quality

The air at Brentwood

Index 52, moderate, led by fine particles. Read at 10 PM from its reporting area, Concord (CA), 18 miles off.

52Moderate
  • Fine particles (PM2.5)52Moderate-
  • Ozone31Good20 ppb5.9 mi
  • Nitrogen dioxide8Good9.6 ppb5.9 mi
  • Sulfur dioxide1Good1.4 ppb5.9 mi
  • Carbon monoxide-0.4 ppm5.9 mi

The days ahead

Highest moderate, Sat Oct 17, led by ozone. Yesterday measured 39, good.

Smoke, the next 43 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 Brentwood

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 Brentwood, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Brentwood, 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

ByronC83

At an airfield/9.1 mi away/52 ft/27 ft below here

temp, wind, gust, visibility, precip, pressure

Rank589of 4,465

measured daily2 instruments

Station report

The weather at Byron, drawn

The nearest airport reporting now, 9.1 mi from Brentwood, California. From its report of Oct 15, 2026, 11:00 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 Byron, 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 C83FIG. A THE SKY OVER BYRONSECTION, 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 MORE0510TITLEByron, the skySTATION REPORT · ASOS C83TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-C83-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

64.4 F with a dew point of 33.8 F, 32 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 6,900 ft up.

Chart of the air at Byron: temperature 64.4 degrees Fahrenheit and dew point 33.8, 32 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 6,900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT C83FIG. B THE AIR AT BYRONTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00020 F30 F40 F50 F60 F70 F80 FSATURATES 6,900 FT ABOVE THE STATION, AT 27.4 FTEMPERATURE 64.4 FDEW POINT 33.8 FSPREAD 30.6 FRELATIVE HUMIDITY 32 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 POINTTITLEByron, the airSTATION REPORT · ASOS C83TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-C83-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west (270 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Byron, north up: blowing from 270 degrees, the west, at 6 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT C83FIG. C THE WIND AT BYRONPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 270°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEByron, the windSTATION REPORT · ASOS C83TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-C83-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Byron, 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 Brentwood

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

Near Brentwood

River and lake gauges