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Grayslake, Illinois

Village in Lake County, Illinois

Air quality

The air at Grayslake

Index 31, good, led by ozone. Read at 2 PM from its reporting area, Lake County (IL), 3 miles off.

31Good
  • Fine particles (PM2.5)6Good13.6 mi
  • Ozone31Good36 ppb13.6 mi
  • Coarse particles (PM10)-19 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 23, good.

Smoke, the next 41 hours

No smoke near the ground through Mon 7 AM.

SatSunMon

Precipitation

What has fallen at Grayslake

0.06 in in the last 24 hours, 0.37 in over the last 3 days, to Sat 2 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.06in
Last 3 days
0.37in

Visibility

How far you can see at Grayslake, the next 41 hours

Visibility stays 10 miles or more through Mon 7 AM.

SatSunMon

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

What is measuring near here

The 6 instruments nearest Grayslake, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.9 miles away.

measured now4 instruments

WaukeganUGN

At an airfield/10.2 mi away/709 ft/72 ft below here

temp, wind, gust, visibility, precip, pressure

Rank9of 1,419

measured daily2 instruments

Fox River AT MchenryMHYI2

At a cooperative observer's station/11.2 mi away/738 ft/43 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Waukegan, drawn

The nearest airport reporting now, 10.2 mi from Grayslake, Illinois. From its report of Oct 17, 2026, 2:51 PM 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 Waukegan, 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 UGNFIG. A THE SKY OVER WAUKEGANSECTION, 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 MORE0510TITLEWaukegan, the skySTATION REPORT · ASOS UGNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-UGN-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

57.0 F with a dew point of 35.0 F, 43 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,000 ft up.

Chart of the air at Waukegan: temperature 57.0 degrees Fahrenheit and dew point 35.0, 43 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,000 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT UGNFIG. B THE AIR AT WAUKEGANTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00020 F30 F40 F50 F60 F70 FSATURATES 5,000 FT ABOVE THE STATION, AT 30.3 FTEMPERATURE 57.0 FDEW POINT 35.0 FSPREAD 22.0 FRELATIVE HUMIDITY 43 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 POINTTITLEWaukegan, the airSTATION REPORT · ASOS UGNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-UGN-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west southwest (240 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 22 mph.

Plan of the wind at Waukegan, north up: blowing from 240 degrees, the west southwest, at 9 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT UGNFIG. C THE WIND AT WAUKEGANPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 240°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWaukegan, the windSTATION REPORT · ASOS UGNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-UGN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Waukegan, 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 Grayslake

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

Near Grayslake

River and lake gauges