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Port Jefferson Station, New York

Community in Suffolk County, New York

Air quality

The air at Port Jefferson Station

Index 15, good, led by fine particles. Read at 1 AM from its reporting area, Bridgeport (CT), 19 miles off.

15Good
  • Fine particles (PM2.5)15Good6.4 mi
  • Ozone-5 ppb6.4 mi
  • Coarse particles (PM10)6Good18.7 mi
  • Nitrogen dioxide1Good1.3 ppb19.9 mi
  • Sulfur dioxide0Good0.1 ppb18.7 mi

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 11, good.

Smoke, the next 44 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 Port Jefferson Station

None in the last 24 hours; 0.06 in over the last 3 days, to Fri 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.06in

Visibility

How far you can see at Port Jefferson Station, the next 44 hours

Mist or haze: visibility falls to 3 miles Fri 6 PM.

FriSat

On the radar over Port Jefferson Station, New YorkReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Port Jefferson Station, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now4 instruments

measured daily2 instruments

Mt SinaiMSIN6

At a cooperative observer's station/2.3 mi away/171 ft/8 ft below here

snowfall, snow depth, precip, high, low

Rank303of 1,432

Station report

The weather at Islip/Macarthur, drawn

The nearest airport reporting now, 9.2 mi from Port Jefferson Station, New York. From its report of Oct 16, 2026, 1:05 AM local time: 3 of its 6 sheets.

The sky

Broken at 2,800 ft, broken at 12,000 ft; the ceiling is 2,800 ft; visibility 10 mi or more.

Section of the sky over Islip/Macarthur, height above the station to scale: broken cloud with its base at 2,800 feet, broken cloud with its base at 12,000 feet, the ceiling at 2,800 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ISPFIG. A THE SKY OVER ISLIP/MACARTHURSECTION, 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 STATION02,5005,0007,50010,00012,50015,00017,50020,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTBKN 12,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 2,800 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 2,800 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEIslip/Macarthur, the skySTATION REPORT · ASOS ISPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-ISP-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014

The air

59.0 F with a dew point of 51.0 F, 75 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,900 ft up; the lowest cloud reported is at 2,800 ft.

Chart of the air at Islip/Macarthur: temperature 59.0 degrees Fahrenheit and dew point 51.0, 75 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,900 feet above the station, against the lowest cloud reported at 2,800 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ISPFIG. B THE AIR AT ISLIP/MACARTHURTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00040 F50 F60 F70 FSATURATES 1,900 FT ABOVE THE STATION, AT 49.1 FLOWEST CLOUD REPORTED, BKN 2,800 FTTEMPERATURE 59.0 FDEW POINT 51.0 FSPREAD 8.0 FRELATIVE HUMIDITY 75 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 POINTTITLEIslip/Macarthur, the airSTATION REPORT · ASOS ISPTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-ISP-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the southeast (140 degrees) at 7 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Islip/Macarthur, north up: blowing from 140 degrees, the southeast, at 7 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 ISPFIG. C THE WIND AT ISLIP/MACARTHURPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 140°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 7 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEIslip/Macarthur, the windSTATION REPORT · ASOS ISPTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-ISP-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Islip/Macarthur, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Mt Sinai (MSIN6), 2.3 miles from here, read 15 Oct, 08:00. measured daily

Elsewhere in New York

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

Near Port Jefferson Station

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

Near Port Jefferson Station

River and lake gauges