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Gilroy, California

City in Santa Clara County, California

Air quality

The air at Gilroy

Index 44, good, led by ozone. Read at 8 PM from its reporting area, Hollister (CA), 17 miles off.

44Good
  • Fine particles (PM2.5)18Good17.1 mi
  • Ozone44Good49 ppb17.1 mi
  • Coarse particles (PM10)39Good17.1 mi
  • Nitrogen dioxide8Good9 ppb21.9 mi
  • Carbon monoxide-0.1 ppm21.9 mi

The days ahead

Good each day through Sun Oct 18, led by ozone. Yesterday measured 37, good.

Smoke, the next 46 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 11 or under.

ThuFriSat

Precipitation

What has fallen at Gilroy

None in the last 3 days, to Thu 7 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 Gilroy, the next 46 hours

Visibility stays 10 miles or more through Sat 5 PM.

ThuFriSat

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

What is measuring near here

The 6 instruments nearest Gilroy, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.9 miles away.

measured now4 instruments

measured daily2 instruments

Gilroy 2.0 SCA-SC-63

In a volunteer observer's own ground/2.3 mi away/221 ft/2 ft below here

precip, snowfall, snow depth

Rank-

Watsonville WaterworksWVIC1

At a cooperative observer's station/11.6 mi away/102 ft/121 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at San Martin, drawn

The nearest airport reporting now, 4.8 mi from Gilroy, California. From its report of Oct 15, 2026, 8:10 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 Martin, 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 E16FIG. A THE SKY OVER SAN MARTINSECTION, 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 Martin, the skySTATION REPORT · ASOS E16TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-E16-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

73.4 F with a dew point of 37.4 F, 27 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 8,200 ft up.

Chart of the air at San Martin: temperature 73.4 degrees Fahrenheit and dew point 37.4, 27 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 8,200 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT E16FIG. B THE AIR AT SAN MARTINTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00020 F30 F40 F50 F60 F70 F80 FSATURATES 8,200 FT ABOVE THE STATION, AT 29.9 FTEMPERATURE 73.4 FDEW POINT 37.4 FSPREAD 36.0 FRELATIVE HUMIDITY 27 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 Martin, the airSTATION REPORT · ASOS E16TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-E16-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at San Martin, 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 E16FIG. C THE WIND AT SAN MARTINPLAN, 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 FORCE73TITLESan Martin, the windSTATION REPORT · ASOS E16TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-E16-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of San Martin, 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 Gilroy

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

Near Gilroy

River and lake gauges