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Darien, Illinois

City in DuPage County, Illinois

Air quality

The air at Darien

Index 31, good, led by fine particles. Read at 1 PM from its reporting area, South and West Suburbs (Chicago) (IL), 7 miles off.

31Good
  • Fine particles (PM2.5)31Good9 mi
  • Ozone14Good17 ppb5.7 mi

The days ahead

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

Smoke, the next 43 hours

No smoke near the ground through Sun 7 AM.

FriSatSun

Precipitation

What has fallen at Darien

0.40 in in the last 24 hours, 0.69 in over the last 3 days, to Fri 12 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.40in
Last 3 days
0.69in

Visibility

How far you can see at Darien, the next 43 hours

Visibility stays 10 miles or more through Sun 7 AM.

FriSatSun

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

What is measuring near here

The 6 instruments nearest Darien, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now4 instruments

measured daily2 instruments

Westmont (Hydro)WJWI2

At a cooperative observer's station/1.8 mi away/741 ft/11 ft below here

snowfall, snow depth, precip, high, low

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Station report

The weather at Romeoville/Chi, drawn

The nearest airport reporting now, 11.4 mi from Darien, Illinois. From its report of Oct 16, 2026, 12:45 PM local time: 3 of its 6 sheets.

The sky

Broken at 2,100 ft, broken at 2,700 ft; the ceiling is 2,100 ft; visibility 8 mi.

Section of the sky over Romeoville/Chi, height above the station to scale: broken cloud with its base at 2,100 feet, broken cloud with its base at 2,700 feet, the ceiling at 2,100 feet, and visibility of 8 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT LOTFIG. A THE SKY OVER ROMEOVILLE/CHISECTION, 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 STATION01,0002,0003,0004,0005,000ETAGESLOWTHE STATIONBKN 2,700 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 2,100 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 2,100 FTVISIBILITY, MILES: 8 MI0510TITLERomeoville/Chi, the skySTATION REPORT · ASOS LOTTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-LOT-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

51.8 F with a dew point of 48.2 F, 87 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up; the lowest cloud reported is at 2,100 ft.

Chart of the air at Romeoville/Chi: temperature 51.8 degrees Fahrenheit and dew point 48.2, 87 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 800 feet above the station, against the lowest cloud reported at 2,100 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT LOTFIG. B THE AIR AT ROMEOVILLE/CHITHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 FSATURATES 800 FT ABOVE THE STATION, AT 47.3 FLOWEST CLOUD REPORTED, BKN 2,100 FTTEMPERATURE 51.8 FDEW POINT 48.2 FSPREAD 3.6 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 POINTTITLERomeoville/Chi, the airSTATION REPORT · ASOS LOTTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-LOT-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (300 degrees) at 9 mph, gusting 22 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 30 mph.

Plan of the wind at Romeoville/Chi, north up: blowing from 300 degrees, the west northwest, at 9 miles an hour, gusting 22; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT LOTFIG. C THE WIND AT ROMEOVILLE/CHIPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE19GUST, 22 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLERomeoville/Chi, the windSTATION REPORT · ASOS LOTTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-LOT-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Romeoville/Chi, 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 Darien

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

Near Darien

River and lake gauges