Storm Station
Rancho Cucamonga, California
85°
Mostly clear· Feels like 83°·Gentle breeze 10 mph WSW
Mostly cloudy, with a low around 69. Northeast wind 0 to 5 mph.
-UV
59Air quality
26%Humidity
37%Cloud

What is measuring near here

The 4 instruments nearest Rancho Cucamonga, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.8 miles away.

measured now2 instruments

Etiwanda 2NNEEWNC1

At a river or reservoir gauge/4.0 mi away/1,768 ft/427 ft above here

temp, wind, gust, humidity, pressure

Rank1,624of 3,115

Ontario INTL ArptONT

At an airfield/5.0 mi away/942 ft/399 ft below here

temp, wind, gust, visibility, precip, pressure

Rank7of 3,115

measured daily2 instruments

Rancho Cucamonga 0.9 WCA-SR-93

In a volunteer observer's own ground/0.8 mi away/1,353 ft/12 ft above here

precip, snowfall, snow depth

Rank-

Riverside Fire STN #3REVC1

At a cooperative observer's station/15.9 mi away/850 ft/491 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Ontario INTL Arpt, drawn

The nearest airport reporting now, 5.0 mi from Rancho Cucamonga. From its report of Sep 26, 2026, 11:53 PM local time: 3 of its 6 sheets.

The sky

A few clouds at 20,000 ft, broken at 25,000 ft; the ceiling is 25,000 ft; visibility 10 mi or more.

Section of the sky over Ontario INTL Arpt, height above the station to scale: a few clouds cloud with its base at 20,000 feet, broken cloud with its base at 25,000 feet, the ceiling at 25,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ONTFIG. A THE SKY OVER ONTARIO INTL ARPTSECTION, 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 STATION05,00010,00015,00020,00025,00030,00035,00040,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTBKN 25,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 20,000 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 25,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEOntario INTL Arpt, the skySTATION REPORT · ASOS ONTTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-ONT-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014, FB-SKY-010, FB-SKY-011, FB-SKY-012

The air

77.0 F with a dew point of 58.0 F, 52 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 4,400 ft up; the lowest cloud reported is at 20,000 ft.

Chart of the air at Ontario INTL Arpt: temperature 77.0 degrees Fahrenheit and dew point 58.0, 52 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 4,400 feet above the station, against the lowest cloud reported at 20,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ONTFIG. B THE AIR AT ONTARIO INTL ARPTTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00012,00014,00040 F50 F60 F70 F80 F90 FSATURATES 4,400 FT ABOVE THE STATION, AT 53.6 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, FEW 20,000 FTTEMPERATURE 77.0 FDEW POINT 58.0 FSPREAD 19.0 FRELATIVE HUMIDITY 52 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 POINTTITLEOntario INTL Arpt, the airSTATION REPORT · ASOS ONTTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-ONT-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west (260 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 23 mph.

Plan of the wind at Ontario INTL Arpt, north up: blowing from 260 degrees, the west, at 6 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ONTFIG. C THE WIND AT ONTARIO INTL ARPTPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 260°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEOntario INTL Arpt, the windSTATION REPORT · ASOS ONTTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-ONT-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Ontario INTL Arpt, in 6 sheets, each beside the Field Book plates that explain it

-in

Snow on the ground

Elsewhere in California

33 places, each with its own forecast and its own instruments.

Near Rancho Cucamonga

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