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Westchester, Illinois

Village in Cook County, Illinois

Air quality

The air at Westchester

Index 18, good, led by ozone. Read at 6 AM from its reporting area, South and West Suburbs (Chicago) (IL), 11 miles off.

18Good
  • Fine particles (PM2.5)10Good7.3 mi
  • Ozone18Good20 ppb7.1 mi
  • Coarse particles (PM10)-20.6 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 35, good.

Smoke, the next 44 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Westchester

0.41 in in the last 24 hours, 0.72 in over the last 3 days, to Fri 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.41in
Last 3 days
0.72in

Visibility

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

Visibility stays 9 miles or more through Sun 1 AM, lowest 10 miles Fri 11 AM.

FriSat

On the radar over Westchester, IllinoisReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Westchester, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now4 instruments

measured daily2 instruments

Westchester 1.0 SSWIL-CK-381

In a volunteer observer's own ground/1.2 mi away/642 ft/5 ft above here

precip, snowfall, snow depth

Rank-

Westmont (Hydro)WJWI2

At a cooperative observer's station/7.7 mi away/741 ft/104 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Chicago OHare, drawn

The nearest airport reporting now, 7.7 mi from Westchester, Illinois. From its report of Oct 16, 2026, 5:51 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 2,600 ft, broken at 3,600 ft; the ceiling is 3,600 ft; visibility 10 mi or more.

Section of the sky over Chicago OHare, height above the station to scale: a few clouds cloud with its base at 2,600 feet, broken cloud with its base at 3,600 feet, the ceiling at 3,600 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ORDFIG. A THE SKY OVER CHICAGO OHARESECTION, 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETBKN 3,600 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 2,600 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 3,600 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEChicago OHare, the skySTATION REPORT · ASOS ORDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-ORD-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

53.0 F with a dew point of 45.0 F, 74 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,800 ft up; the lowest cloud reported is at 2,600 ft.

Chart of the air at Chicago OHare: temperature 53.0 degrees Fahrenheit and dew point 45.0, 74 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,800 feet above the station, against the lowest cloud reported at 2,600 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ORDFIG. B THE AIR AT CHICAGO OHARETHE 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 F60 FSATURATES 1,800 FT ABOVE THE STATION, AT 43.2 FLOWEST CLOUD REPORTED, FEW 2,600 FTTEMPERATURE 53.0 FDEW POINT 45.0 FSPREAD 8.0 FRELATIVE HUMIDITY 74 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 POINTTITLEChicago OHare, the airSTATION REPORT · ASOS ORDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-ORD-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west (280 degrees) at 13 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 38 mph.

Plan of the wind at Chicago OHare, north up: blowing from 280 degrees, the west, at 13 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ORDFIG. C THE WIND AT CHICAGO OHAREPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 280°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 13 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEChicago OHare, the windSTATION REPORT · ASOS ORDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-ORD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Illinois

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

Near Westchester

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

Near Westchester

River and lake gauges