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St. Charles, Illinois

City in Kane County, Illinois

Air quality

The air at St. Charles

Index 16, good, led by fine particles. Read at 10 PM from its reporting area, Aurora and Elgin (IL), 9 miles off.

16Good
  • Fine particles (PM2.5)16Good12.6 mi
  • Ozone9Good7 ppb13.9 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 28, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at St. Charles

0.54 in in the last 24 hours, 0.91 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.54in
Last 3 days
0.91in

Visibility

How far you can see at St. Charles, the next 45 hours

Visibility stays 8 miles or more through Sat 7 PM, lowest 9 miles Thu 11 PM.

FriSat

On the radar over St. Charles, IllinoisReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest St. Charles, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.

measured now5 instruments

measured daily2 instruments

St. Charles 0.1 EIL-KN-64

In a volunteer observer's own ground/0.7 mi away/760 ft/40 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Chicago/Dupage, drawn

The nearest airport reporting now, 3.2 mi from St. Charles, Illinois. From its report of Oct 15, 2026, 10:52 PM local time: 3 of its 6 sheets.

The sky

Broken at 1,200 ft, overcast at 4,200 ft; the ceiling is 1,200 ft; visibility 10 mi or more.

Section of the sky over Chicago/Dupage, height above the station to scale: broken cloud with its base at 1,200 feet, overcast cloud with its base at 4,200 feet, the ceiling at 1,200 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DPAFIG. A THE SKY OVER CHICAGO/DUPAGESECTION, 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 STATION01,0002,0003,0004,0005,0006,0007,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 4,200 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 1,200 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 1,200 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEChicago/Dupage, the skySTATION REPORT · ASOS DPATYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DPA-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

58.0 F with a dew point of 56.0 F, 93 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up; the lowest cloud reported is at 1,200 ft.

Chart of the air at Chicago/Dupage: temperature 58.0 degrees Fahrenheit and dew point 56.0, 93 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, against the lowest cloud reported at 1,200 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DPAFIG. B THE AIR AT CHICAGO/DUPAGETHE 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 F70 FSATURATES 500 FT ABOVE THE STATION, AT 55.5 FLOWEST CLOUD REPORTED, BKN 1,200 FTTEMPERATURE AND DEW POINT 58.0 F, 56.0 FRELATIVE HUMIDITY 93 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/Dupage, the airSTATION REPORT · ASOS DPATYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DPA-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west (280 degrees) at 14 mph, gusting 24 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 31 mph.

Plan of the wind at Chicago/Dupage, north up: blowing from 280 degrees, the west, at 14 miles an hour, gusting 24; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DPAFIG. C THE WIND AT CHICAGO/DUPAGEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 280°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 14 MPH5FRESH BREEZE19GUST, 24 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEChicago/Dupage, the windSTATION REPORT · ASOS DPATYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DPA-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Batavia (Hydro) (BATI2), 5.6 miles from here, read 15 Oct, 06:00. measured daily

Elsewhere in Illinois

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

Near St. Charles

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

Near St. Charles

River and lake gauges