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Williamstown, New Jersey

Community in Gloucester County, New Jersey

Air quality

The air at Williamstown

Index 44, good, led by fine particles. Read at 5 PM from its reporting area, Riverline (NJ), 16 miles off.

44Good
  • Fine particles (PM2.5)44Good14 mi
  • Ozone19Good33 ppb6.8 mi
  • Nitrogen dioxide7Good7 ppb17.6 mi
  • Sulfur dioxide0Good0 ppb17.6 mi
  • Carbon monoxide-0.1 ppm17.6 mi

The days ahead

Highest 55, moderate, Mon Oct 19, led by ozone. Yesterday measured 23, good.

Smoke, the next 45 hours

Little smoke near the ground through Sun 2 PM: the index from smoke stays at 6 or under.

FriSatSun

Precipitation

What has fallen at Williamstown

0.03 in in the last 24 hours, 0.26 in over the last 3 days, to Fri 5 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.03in
Last 3 days
0.26in

Visibility

How far you can see at Williamstown, the next 45 hours

Mist or haze: visibility falls to 1 miles Fri 8 PM.

FriSatSun

On the radar over Williamstown, New JerseyReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Williamstown, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.5 miles away.

measured now3 instruments

Blue AnchorBLAN4

At a river or reservoir gauge/6.5 mi away/128 ft/12 ft below here

temp, wind, gust, humidity, pressure

Rank179of 737

measured daily2 instruments

Monroe Twp 1.7 NWNJ-GL-26

In a volunteer observer's own ground/0.5 mi away/156 ft/16 ft above here

precip, snowfall, snow depth

Rank-

SomerdaleSMDN4

At a cooperative observer's station/10.9 mi away/72 ft/68 ft below here

snowfall, snow depth, precip, high, low

Rank521of 737

Station report

The weather at South Jersey Regional Airport, drawn

The nearest airport reporting now, 19.3 mi from Williamstown, New Jersey. From its report of Oct 16, 2026, 5:54 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 South Jersey Regional Airport, 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 VAYFIG. A THE SKY OVER SOUTH JERSEY REGIONAL AIRPORTSECTION, 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 MORE0510TITLESouth Jersey Regional Airport, the skySTATION REPORT · ASOS VAYTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-VAY-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

74.0 F with a dew point of 67.0 F, 79 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,600 ft up.

Chart of the air at South Jersey Regional Airport: temperature 74.0 degrees Fahrenheit and dew point 67.0, 79 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,600 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT VAYFIG. B THE AIR AT SOUTH JERSEY REGIONAL AIRPORTTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 F80 FSATURATES 1,600 FT ABOVE THE STATION, AT 65.3 FTEMPERATURE 74.0 FDEW POINT 67.0 FSPREAD 7.0 FRELATIVE HUMIDITY 79 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 POINTTITLESouth Jersey Regional Airport, the airSTATION REPORT · ASOS VAYTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-VAY-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

At 5 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at South Jersey Regional Airport, north up: at 5 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 VAYFIG. C THE WIND AT SOUTH JERSEY REGIONAL AIRPORTPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONDIRECTION NOT REPORTEDBEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESouth Jersey Regional Airport, the windSTATION REPORT · ASOS VAYTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-VAY-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of South Jersey Regional Airport, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in New Jersey

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

Near Williamstown

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

Near Williamstown

River and lake gauges