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Waltham, Massachusetts

City in Middlesex County, Massachusetts

Air quality

The air at Waltham

Index 22, good, led by fine particles. Read at 1 AM from its reporting area, Boston Metro (MA), 6 miles off.

22Good
  • Fine particles (PM2.5)22Good7.6 mi
  • Ozone10Good12 ppb8.8 mi
  • Coarse particles (PM10)6Good8.8 mi
  • Nitrogen dioxide15Good16 ppb7.6 mi
  • Sulfur dioxide1Good1.2 ppb7.6 mi
  • Carbon monoxide-0.2 ppm8.8 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 Waltham

None in the last 24 hours; 0.09 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
0.09in

Visibility

How far you can see at Waltham, the next 43 hours

Mist or haze: visibility falls to 1 miles Fri 9 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Waltham, 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

NewtonMA006

Beside a road/3.3 mi away/62 ft/7 ft above here

temp, pavement temp, wind, visibility, precip

Rank740of 744

measured daily2 instruments

Waltham 1.6 SSEMA-MD-218

In a volunteer observer's own ground/0.9 mi away/80 ft/25 ft above here

precip, snowfall, snow depth

Rank-

Jamacia PlainJPBM3

At a cooperative observer's station/8.0 mi away/102 ft/47 ft above here

snowfall, snow depth, precip, high, low

Rank464of 744

Station report

The weather at Hanscom Fld/Bedford, drawn

The nearest airport reporting now, 6.8 mi from Waltham, Massachusetts. From its report of Oct 16, 2026, 1:51 AM local time: 3 of its 6 sheets.

The sky

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

Section of the sky over Hanscom Fld/Bedford, height above the station to scale: broken cloud with its base at 12,000 feet, the ceiling at 12,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BEDFIG. A THE SKY OVER HANSCOM FLD/BEDFORDSECTION, 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 STATION02,5005,0007,50010,00012,50015,00017,50020,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTBKN 12,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEHanscom Fld/Bedford, the skySTATION REPORT · ASOS BEDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BED-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014

The air

43.0 F with a dew point of 41.0 F, 93 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up; the lowest cloud reported is at 12,000 ft.

Chart of the air at Hanscom Fld/Bedford: temperature 43.0 degrees Fahrenheit and dew point 41.0, 93 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 500 feet above the station, against the lowest cloud reported at 12,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BEDFIG. B THE AIR AT HANSCOM FLD/BEDFORDTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00030 F40 F50 FSATURATES 500 FT ABOVE THE STATION, AT 40.5 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, BKN 12,000 FTTEMPERATURE AND DEW POINT 43.0 F, 41.0 FRELATIVE HUMIDITY 93 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 POINTTITLEHanscom Fld/Bedford, the airSTATION REPORT · ASOS BEDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BED-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Hanscom Fld/Bedford, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BEDFIG. C THE WIND AT HANSCOM FLD/BEDFORDPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEHanscom Fld/Bedford, the windSTATION REPORT · ASOS BEDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BED-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Hanscom Fld/Bedford, 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 Waltham

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

Near Waltham

River and lake gauges