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Cupertino, California

City in Santa Clara County, California

Air quality

The air at Cupertino

Index 56, moderate, led by fine particles. Read at 8 PM from its reporting area, San Jose (CA), 8 miles off.

56Moderate
  • Fine particles (PM2.5)56Moderate10.5 mi
  • Ozone41Good41 ppb7.3 mi
  • Nitrogen dioxide43Good46.1 ppb10.5 mi
  • Carbon monoxide-1.1 ppm10.5 mi

The days ahead

Highest moderate, Sat Oct 17, led by fine particles. Yesterday measured 49, good.

Smoke, the next 45 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 Cupertino

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 Cupertino, the next 45 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Cupertino, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.4 miles away.

measured now4 instruments

measured daily2 instruments

Sunnyvale 3.6 SCA-SC-43

In a volunteer observer's own ground/1.5 mi away/184 ft/81 ft below here

precip, snowfall, snow depth

Rank-

Skyline Ridge PreserveSKYC1

In a park or preserve/8.1 mi away/2,253 ft/1,988 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Moffett NAS/Mtn Vie, drawn

The nearest airport reporting now, 6.0 mi from Cupertino, California. From its report of Oct 15, 2026, 8:35 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 9 mi.

Section of the sky over Moffett NAS/Mtn Vie, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 9 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT NUQFIG. A THE SKY OVER MOFFETT NAS/MTN VIESECTION, 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: 9 MI0510TITLEMoffett NAS/Mtn Vie, the skySTATION REPORT · ASOS NUQTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-NUQ-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

68.0 F with a dew point of 55.4 F, 64 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,900 ft up.

Chart of the air at Moffett NAS/Mtn Vie: temperature 68.0 degrees Fahrenheit and dew point 55.4, 64 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT NUQFIG. B THE AIR AT MOFFETT NAS/MTN VIETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00040 F50 F60 F70 F80 FSATURATES 2,900 FT ABOVE THE STATION, AT 52.5 FTEMPERATURE 68.0 FDEW POINT 55.4 FSPREAD 12.6 FRELATIVE HUMIDITY 64 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 POINTTITLEMoffett NAS/Mtn Vie, the airSTATION REPORT · ASOS NUQTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-NUQ-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Moffett NAS/Mtn Vie, 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 NUQFIG. C THE WIND AT MOFFETT NAS/MTN VIEPLAN, 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 FORCE73TITLEMoffett NAS/Mtn Vie, the windSTATION REPORT · ASOS NUQTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-NUQ-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Moffett NAS/Mtn Vie, 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 Cupertino

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

Near Cupertino

River and lake gauges