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Chelsea, Massachusetts

City in Suffolk County, Massachusetts

Air quality

The air at Chelsea

Index 22, good, led by fine particles. Read at 1 AM from its reporting area, Boston Metro (MA), 5 miles off.

22Good
  • Fine particles (PM2.5)22Good4.9 mi
  • Ozone10Good12 ppb5.6 mi
  • Coarse particles (PM10)6Good5.6 mi
  • Nitrogen dioxide15Good16 ppb4.9 mi
  • Sulfur dioxide1Good1.2 ppb4.9 mi
  • Carbon monoxide-0.3 ppm5.3 mi

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 17, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 8 PM.

FriSat

Precipitation

What has fallen at Chelsea

None in the last 24 hours; 0.10 in over the last 3 days, to Fri 1 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 Chelsea, the next 43 hours

Mist or haze: visibility falls to 2 miles Fri 10 AM.

FriSat

On the radar over Chelsea, MassachusettsReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Chelsea, 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

BostonNDBC-BHBM3

At a river or reservoir gauge/3.0 mi away/-/- ft from here

temp, wind, gust, humidity, pressure

Rank668of 744

QuincyMA004

Beside a road/11.0 mi away/131 ft/115 ft above here

temp, pavement temp, wind, visibility, precip

Rank442of 744

measured daily2 instruments

Chelsea 0.3 ESEMA-SF-34

In a volunteer observer's own ground/0.3 mi away/47 ft/31 ft above here

precip, snowfall, snow depth

Rank-

Jamacia PlainJPBM3

At a cooperative observer's station/7.7 mi away/102 ft/86 ft above here

snowfall, snow depth, precip, high, low

Rank464of 744

Station report

The weather at Boston/Logan INTL, drawn

The nearest airport reporting now, 2.7 mi from Chelsea, Massachusetts. From its report of Oct 16, 2026, 1:54 AM local time: 3 of its 6 sheets.

The sky

Broken at 12,000 ft, overcast at 22,000 ft; the ceiling is 12,000 ft; visibility 10 mi or more.

Section of the sky over Boston/Logan INTL, height above the station to scale: broken cloud with its base at 12,000 feet, overcast cloud with its base at 22,000 feet, the ceiling at 12,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BOSFIG. A THE SKY OVER BOSTON/LOGAN INTLSECTION, 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 STATION05,00010,00015,00020,00025,00030,00035,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 22,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 12,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEBoston/Logan INTL, the skySTATION REPORT · ASOS BOSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BOS-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014, FB-SKY-010, FB-SKY-011, FB-SKY-012

The air

52.0 F with a dew point of 39.0 F, 61 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,000 ft up; the lowest cloud reported is at 12,000 ft.

Chart of the air at Boston/Logan INTL: temperature 52.0 degrees Fahrenheit and dew point 39.0, 61 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,000 feet above the station, against the lowest cloud reported at 12,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BOSFIG. B THE AIR AT BOSTON/LOGAN INTLTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00030 F40 F50 F60 FSATURATES 3,000 FT ABOVE THE STATION, AT 36.2 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, BKN 12,000 FTTEMPERATURE 52.0 FDEW POINT 39.0 FSPREAD 13.0 FRELATIVE HUMIDITY 61 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 POINTTITLEBoston/Logan INTL, the airSTATION REPORT · ASOS BOSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BOS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (180 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale.

Plan of the wind at Boston/Logan INTL, north up: blowing from 180 degrees, the south, 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 BOSFIG. C THE WIND AT BOSTON/LOGAN INTLPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 180°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEBoston/Logan INTL, the windSTATION REPORT · ASOS BOSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BOS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Boston/Logan INTL, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Massachusetts

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

Near Chelsea

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

Near Chelsea

River and lake gauges