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Smithtown, New York

Community in Suffolk County, New York

Air quality

The air at Smithtown

Index 26, good, led by ozone. Read at 5 AM from its reporting area, Long Island Region (NY), 22 miles off.

26Good
  • Fine particles (PM2.5)18Good-
  • Ozone26Good-

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 23, good.

Smoke, the next 46 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 Smithtown

None in the last 3 days, to Fri 4 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at Smithtown, the next 46 hours

Mist or haze: visibility falls to 1 miles Fri 10 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Smithtown, 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

Smithtown 1.2 WNY-SF-135

In a volunteer observer's own ground/1.1 mi away/77 ft/10 ft below here

precip, snowfall, snow depth

Rank-

St JamesSTJN6

At a cooperative observer's station/4.3 mi away/128 ft/41 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Islip/Macarthur, drawn

The nearest airport reporting now, 7.7 mi from Smithtown, New York. From its report of Oct 16, 2026, 4:56 AM local time: 3 of its 6 sheets.

The sky

Broken at 2,200 ft, overcast at 4,600 ft; the ceiling is 2,200 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 2,200 feet, overcast cloud with its base at 4,600 feet, the ceiling at 2,200 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 STATION01,0002,0003,0004,0005,0006,0007,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 4,600 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 2,200 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 2,200 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

62.0 F with a dew point of 55.0 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 2,200 ft.

Chart of the air at Islip/Macarthur: temperature 62.0 degrees Fahrenheit and dew point 55.0, 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 2,200 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 STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 1,600 FT ABOVE THE STATION, AT 53.4 FLOWEST CLOUD REPORTED, BKN 2,200 FTTEMPERATURE 62.0 FDEW POINT 55.0 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 6DATE2026-10-16IDSR-ISP-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southeast (150 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 17 mph.

Plan of the wind at Islip/Macarthur, north up: blowing from 150 degrees, the south southeast, at 12 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 150°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE 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

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Snow on the ground

Elsewhere in New York

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

Near Smithtown

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

Near Smithtown

River and lake gauges