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Brea, California

City in Orange County, California

Air quality

The air at Brea

Index 35, good, led by ozone. Read at 1 AM from its reporting area, North Orange CO (CA), 4 miles off.

35Good
  • Fine particles (PM2.5)-7.4 mi
  • Ozone35Good38 ppb3.6 mi
  • Coarse particles (PM10)-7.4 mi
  • Nitrogen dioxide1Good1.2 ppb3.6 mi
  • Sulfur dioxide0Good0.4 ppb21.5 mi
  • Carbon monoxide-0.2 ppm7.8 mi

The days ahead

Moderate each day through Today, led by coarse particles.

Smoke, the next 40 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 Brea

None in the last 3 days, to Fri 1 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 Brea, the next 40 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Brea, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now4 instruments

measured daily2 instruments

Brea 1.8 WCA-OR-38

In a volunteer observer's own ground/0.4 mi away/366 ft/23 ft below here

precip, snowfall, snow depth

Rank-

AnaheimANAC1

At a cooperative observer's station/5.0 mi away/236 ft/153 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Fullerton Municipal, drawn

The nearest airport reporting now, 6.4 mi from Brea, California. From its report of Oct 16, 2026, 1:53 AM 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 Fullerton Municipal, 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 FULFIG. A THE SKY OVER FULLERTON MUNICIPALSECTION, 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 MORE0510TITLEFullerton Municipal, the skySTATION REPORT · ASOS FULTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-FUL-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

85.0 F with a dew point of 38.0 F, 19 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 10,600 ft up.

Chart of the air at Fullerton Municipal: temperature 85.0 degrees Fahrenheit and dew point 38.0, 19 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 10,600 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT FULFIG. B THE AIR AT FULLERTON MUNICIPALTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00012,00014,00020 F40 F60 F80 F100 FSATURATES 10,600 FT ABOVE THE STATION, AT 28.3 FTEMPERATURE 85.0 FDEW POINT 38.0 FSPREAD 47.0 FRELATIVE HUMIDITY 19 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 POINTTITLEFullerton Municipal, the airSTATION REPORT · ASOS FULTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-FUL-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east (80 degrees) at 26 mph, gusting 44 mph: force 6, a strong breeze on the Beaufort scale. The strongest gust today was 44 mph.

Plan of the wind at Fullerton Municipal, north up: blowing from 80 degrees, the east, at 26 miles an hour, gusting 44; beside it the Beaufort scale from calm to hurricane force, force 6, strong breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT FULFIG. C THE WIND AT FULLERTON MUNICIPALPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 80°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE25NOW, 26 MPH7NEAR GALE328GALE39GUST, 44 MPH9STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEFullerton Municipal, the windSTATION REPORT · ASOS FULTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-FUL-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Fullerton Municipal, 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 Brea

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

Near Brea

River and lake gauges