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Grand Terrace, California

City in San Bernardino County, California

Air quality

The air at Grand Terrace

Index 37, good, led by ozone. Read at 11 PM from its reporting area, Metro Riverside CO (CA), 6 miles off.

37Good
  • Fine particles (PM2.5)27Good6.4 mi
  • Ozone37Good42 ppb5.7 mi
  • Coarse particles (PM10)16Good5.7 mi
  • Nitrogen dioxide1Good1.8 ppb5.7 mi
  • Sulfur dioxide0Good0 ppb6.4 mi
  • Carbon monoxide-0.1 ppm6.4 mi

The days ahead

Highest 83, moderate, Fri Oct 16, led by fine particles. Yesterday measured 48, good.

Smoke, the next 43 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 Grand Terrace

None in the last 3 days, to Thu 10 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 Grand Terrace, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Grand Terrace, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.7 miles away.

measured now4 instruments

measured daily2 instruments

Colton 1.9 NWCA-SR-57

In a volunteer observer's own ground/3.7 mi away/1,066 ft/18 ft above here

precip, snowfall, snow depth

Rank-

Riverside Fire STN #3REVC1

At a cooperative observer's station/6.9 mi away/850 ft/198 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at San Bernardino, drawn

The nearest airport reporting now, 6.4 mi from Grand Terrace, California. From its report of Oct 15, 2026, 11:00 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 Bernardino, 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 SBDFIG. A THE SKY OVER SAN BERNARDINOSECTION, 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 Bernardino, the skySTATION REPORT · ASOS SBDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SBD-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

78.0 F with a dew point of 32.5 F, 19 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 10,200 ft up.

Chart of the air at San Bernardino: temperature 78.0 degrees Fahrenheit and dew point 32.5, 19 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 10,200 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SBDFIG. B THE AIR AT SAN BERNARDINOTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00012,00010 F30 F50 F70 F90 FSATURATES 10,200 FT ABOVE THE STATION, AT 23.3 FTEMPERATURE 78.0 FDEW POINT 32.5 FSPREAD 45.5 FRELATIVE HUMIDITY 19 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 Bernardino, the airSTATION REPORT · ASOS SBDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SBD-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east northeast (70 degrees) at 10 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 39 mph.

Plan of the wind at San Bernardino, north up: blowing from 70 degrees, the east northeast, at 10 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SBDFIG. C THE WIND AT SAN BERNARDINOPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 70°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 10 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESan Bernardino, the windSTATION REPORT · ASOS SBDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SBD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of San Bernardino, 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 Grand Terrace

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

Near Grand Terrace

River and lake gauges