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Arcata, California

City in Humboldt County, California

Air quality

The air at Arcata

Index 44, good, led by coarse particles. Read at 9 PM from its reporting area, Eureka (CA), 7 miles off.

44Good
  • Coarse particles (PM10)44Good8.8 mi

The days ahead

Yesterday measured 23, good.

Smoke, the next 44 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Arcata

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 Arcata, the next 44 hours

Dense fog: visibility falls to 0 miles Fri 6 AM, under a mile for 18 hours.

FriSat

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

What is measuring near here

The 5 instruments nearest Arcata, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now3 instruments

measured daily2 instruments

Arcata 0.7 NWCA-HM-58

In a volunteer observer's own ground/0.3 mi away/71 ft/15 ft above here

precip, snowfall, snow depth

Rank-

ScotiaSCTC1

At a cooperative observer's station/27.2 mi away/138 ft/82 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Arcata/Eureka Arpt, drawn

The nearest airport reporting now, 7.1 mi from Arcata, 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 Arcata/Eureka Arpt, 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 ACVFIG. A THE SKY OVER ARCATA/EUREKA ARPTSECTION, 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 MORE0510TITLEArcata/Eureka Arpt, the skySTATION REPORT · ASOS ACVTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-ACV-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

54.0 F with a dew point of 51.0 F, 90 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 700 ft up.

Chart of the air at Arcata/Eureka Arpt: temperature 54.0 degrees Fahrenheit and dew point 51.0, 90 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ACVFIG. B THE AIR AT ARCATA/EUREKA ARPTTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 FSATURATES 700 FT ABOVE THE STATION, AT 50.3 FTEMPERATURE 54.0 FDEW POINT 51.0 FSPREAD 3.0 FRELATIVE HUMIDITY 90 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 POINTTITLEArcata/Eureka Arpt, the airSTATION REPORT · ASOS ACVTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-ACV-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Arcata/Eureka Arpt, 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 ACVFIG. C THE WIND AT ARCATA/EUREKA ARPTPLAN, 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 FORCE73TITLEArcata/Eureka Arpt, the windSTATION REPORT · ASOS ACVTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-ACV-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Arcata/Eureka Arpt, 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 Arcata

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

Near Arcata

River and lake gauges