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Southwest Harbor, Maine

Community in Hancock County, Maine

Air quality

The air at Southwest Harbor

Index 20, good, led by ozone. Read at 6 AM from its reporting area, High Elevations of Acadia National Park (ME), 6 miles off.

20Good
  • Fine particles (PM2.5)-7.5 mi
  • Ozone20Good20 ppb7.1 mi
  • Coarse particles (PM10)-7.5 mi
  • Sulfur dioxide0Good0 ppb7.5 mi
  • Carbon monoxide-0.1 ppm7.5 mi

The days ahead

Good each day through Tue Oct 20, led by ozone. Yesterday measured 24, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 2 AM.

FriSat

Precipitation

What has fallen at Southwest Harbor

None in the last 24 hours; 0.59 in over the last 3 days, to Fri 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.59in

Visibility

How far you can see at Southwest Harbor, the next 45 hours

Dense fog: visibility falls to 0.1 miles Fri 5 PM, under a mile for 5 hours.

FriSat

On the radar over Southwest Harbor, MaineReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Southwest Harbor, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.8 miles away.

measured now4 instruments

Bar HaborBHB

At an airfield/12.0 mi away/79 ft/119 ft below here

temp, wind, gust, visibility, precip, pressure

Rank187of 422

measured daily2 instruments

Southwest Harbor 0.9 NWME-HN-64

In a volunteer observer's own ground/0.8 mi away/99 ft/99 ft below here

precip, snowfall, snow depth

Rank-

East SurryESUM1

At a cooperative observer's station/16.2 mi away/99 ft/99 ft below here

snowfall, snow depth, precip, high, low

Rank188of 422

Station report

The weather at Bar Habor, drawn

The nearest airport reporting now, 12.0 mi from Southwest Harbor, Maine. From its report of Oct 16, 2026, 5:56 AM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Bar Habor, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BHBFIG. A THE SKY OVER BAR HABORSECTION, 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEBar Habor, the skySTATION REPORT · ASOS BHBTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BHB-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

39.0 F with a dew point of 36.0 F, 89 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 700 ft up.

Chart of the air at Bar Habor: temperature 39.0 degrees Fahrenheit and dew point 36.0, 89 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BHBFIG. B THE AIR AT BAR HABORTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00020 F30 F40 F50 FSATURATES 700 FT ABOVE THE STATION, AT 35.3 FTEMPERATURE 39.0 FDEW POINT 36.0 FSPREAD 3.0 FRELATIVE HUMIDITY 89 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 POINTTITLEBar Habor, the airSTATION REPORT · ASOS BHBTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BHB-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northeast (50 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Bar Habor, north up: blowing from 50 degrees, the northeast, at 3 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BHBFIG. C THE WIND AT BAR HABORPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 50°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEBar Habor, the windSTATION REPORT · ASOS BHBTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BHB-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Bar Habor, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at East Surry (ESUM1), 16.2 miles from here, read 14 Oct, 23:59. measured daily

Elsewhere in Maine

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

Near Southwest Harbor

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

Near Southwest Harbor

River and lake gauges