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Holtsville, New York

Community in Suffolk County, New York

Air quality

The air at Holtsville

Index 52, moderate, led by fine particles. Read at 8 PM from its reporting area, Bridgeport (CT), 27 miles off.

52Moderate
  • Fine particles (PM2.5)52Moderate1.3 mi
  • Ozone-27 ppb1.3 mi
  • Coarse particles (PM10)16Good-

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 11, good.

Smoke, the next 42 hours

No smoke near the ground through Sun 2 PM.

SatSun

Precipitation

What has fallen at Holtsville

0.26 in in the last 24 hours, and none in the 2 days before, to Fri 8 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.26in
Last 3 days
0.26in

Visibility

How far you can see at Holtsville, the next 42 hours

Visibility stays 4 miles or more through Sun 2 PM, lowest 4 miles Sat 5 AM.

SatSun

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

What is measuring near here

The 6 instruments nearest Holtsville, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.0 miles away.

measured now4 instruments

measured daily2 instruments

Holbrook 0.6 NWNY-SF-43

In a volunteer observer's own ground/2.0 mi away/91 ft/6 ft below here

precip, snowfall, snow depth

Rank-

St JamesSTJN6

At a cooperative observer's station/7.1 mi away/128 ft/31 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Islip/Macarthur, drawn

The nearest airport reporting now, 3.2 mi from Holtsville, New York. From its report of Oct 16, 2026, 8:56 PM local time: 3 of its 6 sheets.

The sky

A few clouds at 2,900 ft, broken at 4,500 ft, broken at 13,000 ft, broken at 25,000 ft; the ceiling is 4,500 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 2,900 feet, broken cloud with its base at 4,500 feet, broken cloud with its base at 13,000 feet, broken cloud with its base at 25,000 feet, the ceiling at 4,500 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 FTBKN 25,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 13,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 4,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 2,900 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 4,500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEIslip/Macarthur, the skySTATION REPORT · ASOS ISPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-ISP-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014, FB-SKY-010, FB-SKY-011, FB-SKY-012

The air

66.0 F with a dew point of 59.0 F, 78 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,600 ft up; the lowest cloud reported is at 2,900 ft.

Chart of the air at Islip/Macarthur: temperature 66.0 degrees Fahrenheit and dew point 59.0, 78 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, against the lowest cloud reported at 2,900 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 F80 FSATURATES 1,600 FT ABOVE THE STATION, AT 57.4 FLOWEST CLOUD REPORTED, FEW 2,900 FTTEMPERATURE 66.0 FDEW POINT 59.0 FSPREAD 7.0 FRELATIVE HUMIDITY 78 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 6DATE2026-10-17IDSR-ISP-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west (280 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 25 mph.

Plan of the wind at Islip/Macarthur, north up: blowing from 280 degrees, the west, at 9 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 280°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEIslip/Macarthur, the windSTATION REPORT · ASOS ISPTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-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 Holtsville

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

Near Holtsville

River and lake gauges