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Timonium, Maryland

Community in Baltimore County, Maryland

Air quality

The air at Timonium

Index 21, good, led by fine particles. Read at 12 AM from its reporting area, Northern Baltimore (MD), 18 miles off.

21Good
  • Fine particles (PM2.5)21Good16.9 mi
  • Ozone19Good22 ppb12 mi
  • Nitrogen dioxide9Good10.1 ppb9.1 mi
  • Sulfur dioxide0Good0 ppb12 mi
  • Carbon monoxide-0.2 ppm24.7 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 43, good.

Smoke, the next 44 hours

Little smoke near the ground through Sat 8 PM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Timonium

0.07 in in the last 24 hours, and none in the 2 days before, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.07in
Last 3 days
0.07in

Visibility

How far you can see at Timonium, the next 44 hours

Mist or haze: visibility falls to 2 miles Fri 8 AM.

FriSat

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

What is measuring near here

The 7 instruments nearest Timonium, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.5 miles away.

measured now5 instruments

I-83 SB Prior to I-695MD157

Beside a road/2.1 mi away/318 ft/45 ft below here

temp, pavement temp, wind, visibility, precip

Rank-

Powder MillS2049

At a soil climate station/32.3 mi away/105 ft/258 ft below here

temp, humidity, soil temp, soil moisture

Rank734of 736

measured daily2 instruments

CylburCYLM2

At a cooperative observer's station/6.9 mi away/295 ft/68 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Baltimore Inner Harbor, drawn

The nearest airport reporting now, 11.5 mi from Timonium, Maryland. From its report of Oct 16, 2026, 12:53 AM local time: 3 of its 4 sheets.

The air

62.0 F with a dew point of 58.0 F, 87 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up.

Chart of the air at Baltimore Inner Harbor: temperature 62.0 degrees Fahrenheit and dew point 58.0, 87 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DMHFIG. B THE AIR AT BALTIMORE INNER HARBORTHE 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 FSATURATES 900 FT ABOVE THE STATION, AT 57.0 FTEMPERATURE 62.0 FDEW POINT 58.0 FSPREAD 4.0 FRELATIVE HUMIDITY 87 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 POINTTITLEBaltimore Inner Harbor, the airSTATION REPORT · ASOS DMHTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-16IDSR-DMH-1DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 20 ft above sea level, 0 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.90 inHg and the temperature at 58.9 F; the station's altimeter setting of 30.08 inHg means its barometer reads 30.06 inHg; it reports 62.0 F, 3.1 F warmer than standard.

Section from sea level of where Baltimore Inner Harbor stands in the atmosphere, height to scale: the station 20 feet above sea level with 0 per cent of the air below it; the standard atmosphere's pressure there, 29.90 inches of mercury, and temperature, 58.9 degrees Fahrenheit; the altimeter setting of 30.08 and the station pressure it means, 30.06.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DMHFIG. D WHERE BALTIMORE INNER HARBOR STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREBALTIMORE INNER HARBOR0 PER CENT OF THE AIR BELOW IT20 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.90 inHgSTANDARD TEMPERATURE HERE58.9 FALTIMETER SETTING, REPORTED30.08 inHgITS BAROMETER READS30.06 inHgTEMPERATURE, REPORTED62.0 FTITLEBaltimore Inner Harbor, the columnSTATION REPORT · ASOS DMHTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-16IDSR-DMH-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 16 the noon sun stands 42 degrees above the horizon at 39.28 N, and the day is 10 h 60 min long. Level ground there takes 66 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Baltimore Inner Harbor, angles true: on Oct 16 it stands 42 degrees above the horizon, against 74 at the June solstice, 51 at the equinoxes and 27 at the December solstice; the day is 10 h 60 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DMHFIG. E THE SUN AT BALTIMORE INNER HARBORELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 74°EQUINOXES 51°DECEMBER SOLSTICE 27°OCT 16, 42°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 60 MINLEVEL GROUND TAKES 66 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 39.28 N; THE SUN'S DECLINATION -9.1°TITLEBaltimore Inner Harbor, the sunSTATION REPORT · ASOS DMHTYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-16IDSR-DMH-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Baltimore Inner Harbor, in 4 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Maryland

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

Near Timonium

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

Near Timonium

River and lake gauges