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Waterloo, California

Community in San Joaquin County, California

Air quality

The air at Waterloo

Index 80, moderate, led by coarse particles. Read at 10 PM from its reporting area, Stockton (CA), 8 miles off.

80Moderate
  • Fine particles (PM2.5)76Moderate22.6 mi
  • Ozone38Good38 ppb22.6 mi
  • Coarse particles (PM10)80Moderate22.6 mi
  • Nitrogen dioxide3Good3 ppb22.6 mi
  • Sulfur dioxide1Good1.5 ppb24.7 mi
  • Carbon monoxide-0.4 ppm24.7 mi

The days ahead

Moderate each day through Fri Oct 16, led by fine particles. Yesterday measured 50, good.

Smoke, the next 43 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Waterloo

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 Waterloo, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Waterloo, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.5 miles away.

measured now4 instruments

measured daily2 instruments

Acampo 5NEACPC1

At a cooperative observer's station/12.8 mi away/83 ft/26 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Stockton Metro, drawn

The nearest airport reporting now, 9.9 mi from Waterloo, California. From its report of Oct 15, 2026, 10:55 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 Stockton Metro, 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 SCKFIG. A THE SKY OVER STOCKTON METROSECTION, 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 MORE0510TITLEStockton Metro, the skySTATION REPORT · ASOS SCKTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SCK-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

61.0 F with a dew point of 45.0 F, 56 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,700 ft up.

Chart of the air at Stockton Metro: temperature 61.0 degrees Fahrenheit and dew point 45.0, 56 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SCKFIG. B THE AIR AT STOCKTON METROTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00030 F40 F50 F60 F70 FSATURATES 3,700 FT ABOVE THE STATION, AT 41.5 FTEMPERATURE 61.0 FDEW POINT 45.0 FSPREAD 16.0 FRELATIVE HUMIDITY 56 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 POINTTITLEStockton Metro, the airSTATION REPORT · ASOS SCKTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SCK-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east (90 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 16 mph.

Plan of the wind at Stockton Metro, north up: blowing from 90 degrees, the east, 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 SCKFIG. C THE WIND AT STOCKTON METROPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 90°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEStockton Metro, the windSTATION REPORT · ASOS SCKTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SCK-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Stockton Metro, 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 Waterloo

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

Near Waterloo

River and lake gauges