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Rialto, California

City in San Bernardino County, California

Air quality

The air at Rialto

Index 36, good, led by ozone. Read at 12 AM from its reporting area, C San Bernardino (CA), 1 mile off.

36Good
  • Fine particles (PM2.5)2Good-
  • Ozone36Good-
  • Coarse particles (PM10)14Good-

The days ahead

Good each day through Today, led by ozone. Yesterday measured 47, good.

Smoke, the next 41 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 Rialto

None in the last 3 days, to Thu 11 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 Rialto, the next 41 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Rialto, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.1 miles away.

measured now4 instruments

measured daily2 instruments

Riverside Fire STN #3REVC1

At a cooperative observer's station/11.0 mi away/850 ft/440 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Citizen station KB6HGN, drawn

The nearest instrument reporting now, 2.1 mi from Rialto, California. From its report of undefined: 3 of its 4 sheets.

The wind

From the northeast (50 degrees) at 10 mph, gusting 23 mph: force 3, a gentle breeze on the Beaufort scale.

Plan of the wind at Citizen station KB6HGN, north up: blowing from 50 degrees, the northeast, at 10 miles an hour, gusting 23; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT KB6HGNFIG. C THE WIND AT CITIZEN STATION KB6HGNPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 50°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 10 MPH4MODERATE BREEZE135FRESH BREEZE19GUST, 23 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECitizen station KB6HGN, the windSTATION REPORT · CWOP KB6HGNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-16IDSR-KB6HGN-1DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 1,126 ft above sea level, 4 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 28.72 inHg and the temperature at 55.0 F; the station's altimeter setting of 30.03 inHg means its barometer reads 28.83 inHg; it reports 79.0 F, 24.0 F warmer than standard.

Section from sea level of where Citizen station KB6HGN stands in the atmosphere, height to scale: the station 1,126 feet above sea level with 4 per cent of the air below it; the standard atmosphere's pressure there, 28.72 inches of mercury, and temperature, 55.0 degrees Fahrenheit; the altimeter setting of 30.03 and the station pressure it means, 28.83.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT KB6HGNFIG. D WHERE CITIZEN STATION KB6HGN 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 ATMOSPHERECITIZEN STATION KB6HGN4 PER CENT OF THE AIR BELOW IT1,126 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 HERE28.72 inHgSTANDARD TEMPERATURE HERE55.0 FALTIMETER SETTING, REPORTED30.03 inHgITS BAROMETER READS28.83 inHgTEMPERATURE, REPORTED79.0 FTITLECitizen station KB6HGN, the columnSTATION REPORT · CWOP KB6HGNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-16IDSR-KB6HGN-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 16 the noon sun stands 47 degrees above the horizon at 34.08 N, and the day is 11 h 10 min long. Level ground there takes 73 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Citizen station KB6HGN, angles true: on Oct 16 it stands 47 degrees above the horizon, against 79 at the June solstice, 56 at the equinoxes and 32 at the December solstice; the day is 11 h 10 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT KB6HGNFIG. E THE SUN AT CITIZEN STATION KB6HGNELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 79°EQUINOXES 56°DECEMBER SOLSTICE 32°OCT 16, 47°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 11 H 10 MINLEVEL GROUND TAKES 73 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 34.08 N; THE SUN'S DECLINATION -9.1°TITLECitizen station KB6HGN, the sunSTATION REPORT · CWOP KB6HGNTYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-16IDSR-KB6HGN-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Citizen station KB6HGN, in 4 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 Rialto

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

Near Rialto

River and lake gauges