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Port Jefferson, New York

Village in Suffolk County, New York

Air quality

The air at Port Jefferson

Index 21, good, led by fine particles. Read at 8 AM from its reporting area, Bridgeport (CT), 18 miles off.

21Good
  • Fine particles (PM2.5)21Good7.8 mi
  • Ozone-21 ppb7.8 mi
  • Coarse particles (PM10)9Good17.5 mi
  • Nitrogen dioxide2Good2 ppb19 mi
  • Sulfur dioxide0Good0 ppb17.5 mi

The days ahead

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

Smoke, the next 43 hours

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

FriSat

Precipitation

What has fallen at Port Jefferson

None in the last 24 hours; 0.10 in over the last 3 days, to Fri 7 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.10in

Visibility

How far you can see at Port Jefferson, the next 43 hours

Visibility stays 3 miles or more through Sun 2 AM, lowest 3 miles Fri 11 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Port Jefferson, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.1 miles away.

measured now4 instruments

measured daily2 instruments

Mt SinaiMSIN6

At a cooperative observer's station/2.1 mi away/171 ft/24 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, 10.5 mi from Port Jefferson, New York. From its report of Oct 16, 2026, 7:56 AM local time: 3 of its 6 sheets.

The sky

Scattered at 2,500 ft, broken at 3,400 ft, overcast at 6,000 ft; the ceiling is 3,400 ft; visibility 10 mi or more.

Section of the sky over Islip/Macarthur, height above the station to scale: scattered cloud with its base at 2,500 feet, broken cloud with its base at 3,400 feet, overcast cloud with its base at 6,000 feet, the ceiling at 3,400 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 STATION02,5005,0007,50010,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 6,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 3,400 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 2,500 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 3,400 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

The air

63.0 F with a dew point of 60.0 F, 90 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 700 ft up; the lowest cloud reported is at 2,500 ft.

Chart of the air at Islip/Macarthur: temperature 63.0 degrees Fahrenheit and dew point 60.0, 90 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 700 feet above the station, against the lowest cloud reported at 2,500 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 STATION01,0002,0003,0004,00050 F60 F70 FSATURATES 700 FT ABOVE THE STATION, AT 59.3 FLOWEST CLOUD REPORTED, SCT 2,500 FTTEMPERATURE 63.0 FDEW POINT 60.0 FSPREAD 3.0 FRELATIVE HUMIDITY 90 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-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (170 degrees) at 13 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 17 mph.

Plan of the wind at Islip/Macarthur, north up: blowing from 170 degrees, the south, at 13 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 4, moderate 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 170°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 13 MPH5FRESH 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), 2.1 miles from here, read 16 Oct, 08:00. measured daily

Elsewhere in New York

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

Near Port Jefferson

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

Near Port Jefferson

River and lake gauges