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East Foothills, California

Community in Santa Clara County, California

Air quality

The air at East Foothills

Index 58, moderate, led by fine particles. Read at 9 PM from its reporting area, San Jose (CA), 6 miles off.

58Moderate
  • Fine particles (PM2.5)58Moderate3.3 mi
  • Ozone37Good38 ppb13.7 mi
  • Nitrogen dioxide42Good44.5 ppb3.3 mi
  • Carbon monoxide-1.2 ppm3.3 mi

The days ahead

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

Smoke, the next 44 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 17 or under.

FriSat

Precipitation

What has fallen at East Foothills

None in the last 3 days, to Thu 9 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 East Foothills, the next 44 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest East Foothills, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.5 miles away.

measured now4 instruments

measured daily2 instruments

San Jose 6.0 NCA-SC-80

In a volunteer observer's own ground/0.9 mi away/245 ft/89 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at San Jose/Reid/Hillv, drawn

The nearest airport reporting now, 3.6 mi from East Foothills, California. From its report of Oct 15, 2026, 10:00 PM local time: 3 of its 6 sheets.

The sky

Clear; visibility 10 mi or more.

Section of the sky over San Jose/Reid/Hillv, height above the station to scale: a clear sky, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RHVFIG. A THE SKY OVER SAN JOSE/REID/HILLVSECTION, 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 STATIONCLEARVISIBILITY, MILES: 10 MI OR MORE0510TITLESan Jose/Reid/Hillv, the skySTATION REPORT · ASOS RHVTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-RHV-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

66.2 F with a dew point of 42.8 F, 43 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,300 ft up.

Chart of the air at San Jose/Reid/Hillv: temperature 66.2 degrees Fahrenheit and dew point 42.8, 43 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,300 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RHVFIG. B THE AIR AT SAN JOSE/REID/HILLVTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00030 F40 F50 F60 F70 F80 FSATURATES 5,300 FT ABOVE THE STATION, AT 37.7 FTEMPERATURE 66.2 FDEW POINT 42.8 FSPREAD 23.4 FRELATIVE HUMIDITY 43 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 Jose/Reid/Hillv, the airSTATION REPORT · ASOS RHVTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-RHV-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at San Jose/Reid/Hillv, 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 RHVFIG. C THE WIND AT SAN JOSE/REID/HILLVPLAN, 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 Jose/Reid/Hillv, the windSTATION REPORT · ASOS RHVTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-RHV-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of San Jose/Reid/Hillv, 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 East Foothills

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

Near East Foothills

River and lake gauges