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Lake Arrowhead, California

Community in San Bernardino County, California

Air quality

The air at Lake Arrowhead

Index 44, good, led by ozone. Read at 9 PM from its reporting area, C San Bernardino M (CA), 4 miles off.

44Good
  • Fine particles (PM2.5)0Good4.2 mi
  • Ozone44Good45 ppb4.2 mi
  • Coarse particles (PM10)-10.8 mi
  • Nitrogen dioxide2Good2.1 ppb10.8 mi
  • Sulfur dioxide0Good0.2 ppb19.6 mi
  • Carbon monoxide-0.1 ppm21.3 mi

The days ahead

Good each day through Fri Oct 16, led by ozone. Yesterday measured 41, good.

Smoke, the next 44 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 Lake Arrowhead

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 Lake Arrowhead, the next 44 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Lake Arrowhead, 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

measured daily2 instruments

Lake Arrowhead 1.3 WNWCA-SR-70

In a volunteer observer's own ground/0.9 mi away/5,364 ft/195 ft above here

precip, snowfall, snow depth

Rank-

Hesperia 1ENEHESC1

At a cooperative observer's station/12.0 mi away/3,051 ft/2,118 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at San Bernardino, drawn

The nearest airport reporting now, 11.1 mi from Lake Arrowhead, California. From its report of Oct 15, 2026, 9:40 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 San Bernardino, 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 SBDFIG. A THE SKY OVER SAN BERNARDINOSECTION, 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 MORE0510TITLESan Bernardino, the skySTATION REPORT · ASOS SBDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SBD-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

82.2 F with a dew point of 30.2 F, 15 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 11,700 ft up.

Chart of the air at San Bernardino: temperature 82.2 degrees Fahrenheit and dew point 30.2, 15 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 11,700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SBDFIG. B THE AIR AT SAN BERNARDINOTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00012,00014,00010 F30 F50 F70 F90 FSATURATES 11,700 FT ABOVE THE STATION, AT 19.9 FTEMPERATURE 82.2 FDEW POINT 30.2 FSPREAD 52.0 FRELATIVE HUMIDITY 15 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 POINTTITLESan Bernardino, the airSTATION REPORT · ASOS SBDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SBD-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east (100 degrees) at 7 mph, gusting 24 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 39 mph.

Plan of the wind at San Bernardino, north up: blowing from 100 degrees, the east, at 7 miles an hour, gusting 24; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SBDFIG. C THE WIND AT SAN BERNARDINOPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 100°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 7 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19GUST, 24 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESan Bernardino, the windSTATION REPORT · ASOS SBDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SBD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of San Bernardino, 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 Lake Arrowhead

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

Near Lake Arrowhead

River and lake gauges