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Glendora, California

City in Los Angeles County, California

Air quality

The air at Glendora

Index 34, good, led by ozone. Read at 3 AM from its reporting area, E San Gabriel Vly (CA), 2 miles off.

34Good
  • Fine particles (PM2.5)28Good1.1 mi
  • Ozone34Good37 ppb1.1 mi
  • Coarse particles (PM10)15Good1.1 mi
  • Nitrogen dioxide2Good2.1 ppb1.1 mi
  • Sulfur dioxide0Good0.3 ppb21.2 mi
  • Carbon monoxide-0.1 ppm19.6 mi

The days ahead

Good each day through Today, led by ozone. Yesterday measured 41, good.

Smoke, the next 44 hours

Little smoke near the ground through Sun 11 PM: the index from smoke stays at 28 or under.

SatSun

Precipitation

What has fallen at Glendora

None in the last 3 days, to Sat 3 AM. 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 Glendora, the next 44 hours

Visibility stays 10 miles or more through Sun 11 PM.

SatSun

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

What is measuring near here

The 6 instruments nearest Glendora, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.7 miles away.

measured now4 instruments

I-15 : Jurupa AvenueCF174

Beside a road/18.5 mi away/908 ft/154 ft above here

temp, pavement temp, wind, visibility, precip

Rank-

measured daily2 instruments

Covina YardCTFC1

At a cooperative observer's station/2.8 mi away/594 ft/160 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Santa Fe Dam RAWS, drawn

The nearest instrument reporting now, 5.0 mi from Glendora, California. From its report of Oct 17, 2026, 3:57 AM local time: 3 of its 5 sheets.

The air

78.0 F with a dew point of 40.3 F, 26 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 8,500 ft up.

Chart of the air at Santa Fe Dam RAWS: temperature 78.0 degrees Fahrenheit and dew point 40.3, 26 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 8,500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STFC1FIG. B THE AIR AT SANTA FE DAM RAWSTHE 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 F40 F60 F80 FSATURATES 8,500 FT ABOVE THE STATION, AT 32.4 FTEMPERATURE 78.0 FDEW POINT 40.3 FSPREAD 37.7 FRELATIVE HUMIDITY 26 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 POINTTITLESanta Fe Dam RAWS, the airSTATION REPORT · DCP STFC1TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-17IDSR-STFC1-1DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east northeast (58 degrees) at 4 mph, gusting 15 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 15 mph.

Plan of the wind at Santa Fe Dam RAWS, north up: blowing from 58 degrees, the east northeast, at 4 miles an hour, gusting 15; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STFC1FIG. C THE WIND AT SANTA FE DAM RAWSPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 58°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 4 MPH3GENTLE BREEZE84MODERATE BREEZE13GUST, 15 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESanta Fe Dam RAWS, the windSTATION REPORT · DCP STFC1TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-17IDSR-STFC1-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 518 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.37 inHg and the temperature at 57.2 F; it reports 78.0 F, 20.8 F warmer than standard.

Section from sea level of where Santa Fe Dam RAWS stands in the atmosphere, height to scale: the station 518 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.37 inches of mercury, and temperature, 57.2 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STFC1FIG. D WHERE SANTA FE DAM RAWS STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHERESANTA FE DAM RAWS2 PER CENT OF THE AIR BELOW IT518 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.37 inHgSTANDARD TEMPERATURE HERE57.2 FTEMPERATURE, REPORTED78.0 FTITLESanta Fe Dam RAWS, the columnSTATION REPORT · DCP STFC1TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-17IDSR-STFC1-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Santa Fe Dam RAWS, in 5 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 Glendora

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

Near Glendora

River and lake gauges