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Reliez Valley, California

Community in Contra Costa County, California

Air quality

The air at Reliez Valley

Index 54, moderate, led by fine particles. Read at 9 PM from its reporting area, Concord (CA), 4 miles off.

54Moderate
  • Fine particles (PM2.5)54Moderate12.2 mi
  • Ozone41Good12 ppb12.2 mi
  • Nitrogen dioxide20Good21.9 ppb12.2 mi
  • Sulfur dioxide0Good0.4 ppb13.2 mi
  • Carbon monoxide-0.5 ppm12.2 mi

The days ahead

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

Smoke, the next 45 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 Reliez Valley

None in the last 3 days, to Thu 8 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 Reliez Valley, the next 45 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Reliez Valley, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.

measured now4 instruments

Briones RAWSPLEC1

A remote fire weather station/1.6 mi away/1,369 ft/984 ft above here

temp, wind, gust, humidity, pressure

Rank734of 4,465

measured daily2 instruments

Lafayette 2.7 NNECA-CC-48

In a volunteer observer's own ground/0.7 mi away/296 ft/89 ft below here

precip, snowfall, snow depth

Rank-

BerkleyBEYC1

At a cooperative observer's station/9.9 mi away/333 ft/52 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Concord/Buchanan, drawn

The nearest airport reporting now, 4.3 mi from Reliez Valley, 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 Concord/Buchanan, 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 CCRFIG. A THE SKY OVER CONCORD/BUCHANANSECTION, 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 MORE0510TITLEConcord/Buchanan, the skySTATION REPORT · ASOS CCRTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-CCR-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

69.0 F with a dew point of 44.0 F, 40 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,700 ft up.

Chart of the air at Concord/Buchanan: temperature 69.0 degrees Fahrenheit and dew point 44.0, 40 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CCRFIG. B THE AIR AT CONCORD/BUCHANANTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,0008,00030 F40 F50 F60 F70 F80 FSATURATES 5,700 FT ABOVE THE STATION, AT 38.6 FTEMPERATURE 69.0 FDEW POINT 44.0 FSPREAD 25.0 FRELATIVE HUMIDITY 40 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 POINTTITLEConcord/Buchanan, the airSTATION REPORT · ASOS CCRTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-CCR-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (190 degrees) at 3 mph: force 1, a light air on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at Concord/Buchanan, north up: blowing from 190 degrees, the south, 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 CCRFIG. C THE WIND AT CONCORD/BUCHANANPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 190°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEConcord/Buchanan, the windSTATION REPORT · ASOS CCRTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-CCR-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Concord/Buchanan, 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 Reliez Valley

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

Near Reliez Valley

River and lake gauges