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South Williamsport, Pennsylvania

Borough in Lycoming County, Pennsylvania

Air quality

The air at South Williamsport

Index 21, good, led by fine particles. Read at 3 AM from its reporting area, Williamsport (PA), 1 mile off.

21Good
  • Fine particles (PM2.5)21Good-
  • Ozone10Good-

The days ahead

Good each day through Tue Oct 20, led by fine particles. Yesterday measured 27, good.

Smoke, the next 42 hours

No smoke near the ground through Mon 8 PM.

SunMon

Precipitation

What has fallen at South Williamsport

None in the last 24 hours; 0.87 in over the last 3 days, to Sun 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.87in

Visibility

How far you can see at South Williamsport, the next 42 hours

Visibility stays 10 miles or more through Mon 8 PM.

SunMon

On the radar over South Williamsport, PennsylvaniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest South Williamsport, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.5 miles away.

measured now4 instruments

measured daily2 instruments

Williamsport 1.7 ENEPA-LY-12

In a volunteer observer's own ground/1.5 mi away/579 ft/33 ft above here

precip, snowfall, snow depth

Rank-

WilliamsportWMSP1

At a cooperative observer's station/1.5 mi away/528 ft/18 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Williamsport, drawn

The nearest airport reporting now, 4.1 mi from South Williamsport, Pennsylvania. From its report of Oct 18, 2026, 2:54 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 Williamsport, 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 IPTFIG. A THE SKY OVER WILLIAMSPORTSECTION, 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 MORE0510TITLEWilliamsport, the skySTATION REPORT · ASOS IPTTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-18IDSR-IPT-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

32.0 F with a dew point of 30.0 F, 92 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up.

Chart of the air at Williamsport: temperature 32.0 degrees Fahrenheit and dew point 30.0, 92 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; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IPTFIG. B THE AIR AT WILLIAMSPORTTHE 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 FSATURATES 500 FT ABOVE THE STATION, AT 29.6 FTEMPERATURE AND DEW POINT 32.0 F, 30.0 FRELATIVE HUMIDITY 92 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 POINTTITLEWilliamsport, the airSTATION REPORT · ASOS IPTTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-18IDSR-IPT-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north (350 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Williamsport, north up: blowing from 350 degrees, the north, 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 IPTFIG. C THE WIND AT WILLIAMSPORTPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 350°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWilliamsport, the windSTATION REPORT · ASOS IPTTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-18IDSR-IPT-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Pennsylvania

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

Near South Williamsport

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

Near South Williamsport

River and lake gauges