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Princeton Junction, New Jersey

Community in Mercer County, New Jersey

Air quality

The air at Princeton Junction

Index 18, good, led by ozone. Read at 3 AM from its reporting area, Central (NJ), 17 miles off.

18Good
  • Fine particles (PM2.5)17Good-
  • Ozone18Good-

The days ahead

Good each day through Today, led by ozone. Yesterday measured 26, good.

Smoke, the next 41 hours

Little smoke near the ground through Sat 8 PM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Princeton Junction

None in the last 24 hours; 0.14 in over the last 3 days, to Fri 3 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.14in

Visibility

How far you can see at Princeton Junction, the next 41 hours

Fog: visibility falls to 0.6 miles Fri 7 PM, under a mile for 1 hour.

FriSat

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

What is measuring near here

The 5 instruments nearest Princeton Junction, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now3 instruments

measured daily2 instruments

HightstownHGTN4

At a cooperative observer's station/4.4 mi away/98 ft/10 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Trenton/Mercer Co., drawn

The nearest airport reporting now, 10.6 mi from Princeton Junction, New Jersey. From its report of Oct 16, 2026, 2:53 AM local time: 3 of its 6 sheets.

The sky

Broken at 2,400 ft, overcast at 3,500 ft; the ceiling is 2,400 ft; visibility 10 mi or more.

Section of the sky over Trenton/Mercer Co., height above the station to scale: broken cloud with its base at 2,400 feet, overcast cloud with its base at 3,500 feet, the ceiling at 2,400 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TTNFIG. A THE SKY OVER TRENTON/MERCER CO.SECTION, 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,500 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 2,400 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 2,400 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLETrenton/Mercer Co., the skySTATION REPORT · ASOS TTNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-TTN-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

59.0 F with a dew point of 53.0 F, 80 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,400 ft up; the lowest cloud reported is at 2,400 ft.

Chart of the air at Trenton/Mercer Co.: temperature 59.0 degrees Fahrenheit and dew point 53.0, 80 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,400 feet above the station, against the lowest cloud reported at 2,400 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TTNFIG. B THE AIR AT TRENTON/MERCER CO.THE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 1,400 FT ABOVE THE STATION, AT 51.6 FLOWEST CLOUD REPORTED, BKN 2,400 FTTEMPERATURE 59.0 FDEW POINT 53.0 FSPREAD 6.0 FRELATIVE HUMIDITY 80 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 POINTTITLETrenton/Mercer Co., the airSTATION REPORT · ASOS TTNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-TTN-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southeast (150 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Trenton/Mercer Co., north up: blowing from 150 degrees, the south southeast, 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 TTNFIG. C THE WIND AT TRENTON/MERCER CO.PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 150°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLETrenton/Mercer Co., the windSTATION REPORT · ASOS TTNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-TTN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Trenton/Mercer Co., in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Hightstown (HGTN4), 4.4 miles from here, read 9 Oct, 07:00. measured daily

Elsewhere in New Jersey

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

Near Princeton Junction

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

Near Princeton Junction

River and lake gauges