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Head of the Harbor, New York

Village in Suffolk County, New York

Air quality

The air at Head of the Harbor

Index 18, good, led by fine particles. Read at 5 PM from its reporting area, Bridgeport (CT), 20 miles off.

18Good
  • Fine particles (PM2.5)18Good6.9 mi
  • Ozone-35 ppb6.9 mi
  • Coarse particles (PM10)8Good19.5 mi
  • Nitrogen dioxide2Good2.9 ppb18.3 mi
  • Sulfur dioxide0Good0.3 ppb19.5 mi

The days ahead

Good each day through Tue Oct 20, led by fine particles. Yesterday measured 26, good.

Smoke, the next 46 hours

No smoke near the ground through Wed 2 PM.

MonTueWed

Precipitation

What has fallen at Head of the Harbor

None in the last 24 hours; 0.24 in over the last 3 days, to Mon 4 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.24in

Visibility

How far you can see at Head of the Harbor, the next 46 hours

Visibility stays 9 miles or more through Wed 2 PM, lowest 10 miles Tue 2 AM.

MonTueWed

On the radar over Head of the Harbor, New YorkReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Head of the Harbor, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.

measured now4 instruments

measured daily2 instruments

St. James 0.8 NNY-SF-12

In a volunteer observer's own ground/0.7 mi away/151 ft/level with here

precip, snowfall, snow depth

Rank-

St JamesSTJN6

At a cooperative observer's station/1.2 mi away/128 ft/23 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Islip/Macarthur, drawn

The nearest airport reporting now, 7.6 mi from Head of the Harbor, New York. From its report of Oct 19, 2026, 4:56 PM local time: 3 of its 6 sheets.

The sky

A few clouds at 25,000 ft; visibility 10 mi or more.

Section of the sky over Islip/Macarthur, height above the station to scale: a few clouds cloud with its base at 25,000 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 STATION05,00010,00015,00020,00025,00030,00035,00040,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTFEW 25,000 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLEIslip/Macarthur, the skySTATION REPORT · ASOS ISPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-19IDSR-ISP-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-010, FB-SKY-011, FB-SKY-012

The air

61.0 F with a dew point of 39.0 F, 44 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,000 ft up; the lowest cloud reported is at 25,000 ft.

Chart of the air at Islip/Macarthur: temperature 61.0 degrees Fahrenheit and dew point 39.0, 44 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,000 feet above the station, against the lowest cloud reported at 25,000 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 STATION02,0004,0006,0008,00010,00012,00014,00020 F30 F40 F50 F60 F70 FSATURATES 5,000 FT ABOVE THE STATION, AT 34.3 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, FEW 25,000 FTTEMPERATURE 61.0 FDEW POINT 39.0 FSPREAD 22.0 FRELATIVE HUMIDITY 44 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 6DATE2026-10-19IDSR-ISP-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northeast (30 degrees) at 8 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at Islip/Macarthur, north up: blowing from 30 degrees, the north northeast, at 8 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle 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 30°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 8 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEIslip/Macarthur, the windSTATION REPORT · ASOS ISPTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-19IDSR-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

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Snow on the ground

Elsewhere in New York

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

Near Head of the Harbor

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

Near Head of the Harbor

River and lake gauges