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Vallejo, California

City in Solano County, California

Air quality

The air at Vallejo

Index 19, good, led by nitrogen dioxide. Read at 5 AM from its reporting area, Fairfield (CA), 15 miles off.

19Good
  • Fine particles (PM2.5)-17.3 mi
  • Ozone10Good4 ppb17.3 mi
  • Nitrogen dioxide19Good20 ppb17.3 mi
  • Carbon monoxide-0.6 ppm17.3 mi

The days ahead

Highest moderate, Sat Oct 17, led by ozone. Yesterday measured 42, good.

Smoke, the next 42 hours

Little smoke near the ground through Sat 11 PM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Vallejo

None in the last 3 days, to Fri 5 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 Vallejo, the next 42 hours

Visibility stays 10 miles or more through Sat 11 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Vallejo, 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

measured daily2 instruments

Vallejo 3.3 NECA-SO-5

In a volunteer observer's own ground/2.2 mi away/122 ft/39 ft above here

precip, snowfall, snow depth

Rank-

VallejoVLJC1

At a cooperative observer's station/2.8 mi away/362 ft/279 ft above here

snowfall, snow depth, precip, high, low

Rank2,302of 4,465

Station report

The weather at Napa County, drawn

The nearest airport reporting now, 6.9 mi from Vallejo, California. From its report of Oct 16, 2026, 4:54 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 Napa County, 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 APCFIG. A THE SKY OVER NAPA COUNTYSECTION, 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 MORE0510TITLENapa County, the skySTATION REPORT · ASOS APCTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-APC-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

50.0 F with a dew point of 41.0 F, 71 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,100 ft up.

Chart of the air at Napa County: temperature 50.0 degrees Fahrenheit and dew point 41.0, 71 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,100 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT APCFIG. B THE AIR AT NAPA COUNTYTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00030 F40 F50 F60 FSATURATES 2,100 FT ABOVE THE STATION, AT 39.0 FTEMPERATURE 50.0 FDEW POINT 41.0 FSPREAD 9.0 FRELATIVE HUMIDITY 71 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 POINTTITLENapa County, the airSTATION REPORT · ASOS APCTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-APC-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Napa County, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT APCFIG. C THE WIND AT NAPA COUNTYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLENapa County, the windSTATION REPORT · ASOS APCTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-APC-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Napa County, 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 Vallejo

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

Near Vallejo

River and lake gauges