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North Potomac, Maryland

Community in Montgomery County, Maryland

Air quality

The air at North Potomac

Index 13, good, led by ozone. Read at 5 AM from its reporting area, Suburban DC (MD), 14 miles off.

13Good
  • Fine particles (PM2.5)0Good6.7 mi
  • Ozone13Good11 ppb6.7 mi
  • Nitrogen dioxide3Good3.4 ppb19.1 mi
  • Sulfur dioxide0Good0 ppb19.1 mi
  • Carbon monoxide-0.1 ppm19.1 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 21, 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 North Potomac

0.09 in in the last 24 hours, and none in the 2 days before, to Fri 4 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.09in
Last 3 days
0.09in

Visibility

How far you can see at North Potomac, the next 46 hours

Visibility stays 3 miles or more through Sun 2 AM, lowest 3 miles Fri 5 AM.

FriSat

On the radar over North Potomac, MarylandReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest North Potomac, 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 now5 instruments

GaithersburgGAI

At an airfield/6.2 mi away/539 ft/159 ft above here

temp, wind, gust, visibility, precip, pressure

Rank76of 736

Powder MillS2049

At a soil climate station/21.3 mi away/105 ft/275 ft below here

temp, humidity, soil temp, soil moisture

Rank734of 736

measured daily2 instruments

North Potomac 0.8 NEMD-MG-126

In a volunteer observer's own ground/0.7 mi away/317 ft/63 ft below here

precip, snowfall, snow depth

Rank-

Damascus 3 SSWDMAM2

At a cooperative observer's station/11.8 mi away/676 ft/296 ft above here

snowfall, snow depth, precip, high, low

Rank31of 736

Station report

The weather at Gaithersburg, drawn

The nearest airport reporting now, 6.2 mi from North Potomac, Maryland. From its report of Oct 16, 2026, 5:38 AM local time: 3 of its 6 sheets.

The sky

Overcast at 200 ft; the ceiling is 200 ft; visibility 4 mi.

Section of the sky over Gaithersburg, height above the station to scale: overcast cloud with its base at 200 feet, the ceiling at 200 feet, and visibility of 4 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GAIFIG. A THE SKY OVER GAITHERSBURGSECTION, 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 SHEETOVC 200 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 200 FTVISIBILITY, MILES: 4 MI0510TITLEGaithersburg, the skySTATION REPORT · ASOS GAITYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-GAI-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

60.8 F with a dew point of 60.8 F, 100 per cent relative humidity. The air is saturated at the ground; the lowest cloud reported is at 200 ft.

Chart of the air at Gaithersburg: temperature 60.8 degrees Fahrenheit and dew point 60.8, 100 per cent relative humidity; the air saturated at the ground, against the lowest cloud reported at 200 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GAIFIG. B THE AIR AT GAITHERSBURGTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 FSATURATED AT THE GROUNDLOWEST CLOUD REPORTED, OVC 200 FTTEMPERATURE AND DEW POINT 60.8 F, 60.8 FRELATIVE HUMIDITY 100 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 POINTTITLEGaithersburg, the airSTATION REPORT · ASOS GAITYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-GAI-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (180 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Gaithersburg, north up: blowing from 180 degrees, the south, at 5 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GAIFIG. C THE WIND AT GAITHERSBURGPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 180°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEGaithersburg, the windSTATION REPORT · ASOS GAITYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-GAI-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-

Snow on the ground

Elsewhere in Maryland

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

Near North Potomac

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

Near North Potomac

River and lake gauges