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Illiopolis, Illinois

Village in Sangamon County, Illinois

Air quality

The air at Illiopolis

Index 14, good, led by ozone. Read at 3 AM from its reporting area, Decatur (IL), 15 miles off.

14Good
  • Fine particles (PM2.5)10Good17.2 mi
  • Ozone14Good21 ppb17.2 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 36, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Illiopolis

0.40 in in the last 24 hours, and none in the 2 days before, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.40in
Last 3 days
0.40in

Visibility

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

Visibility stays 4 miles or more through Sat 7 PM, lowest 4 miles Fri 2 PM.

FriSat

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

What is measuring near here

The 5 instruments nearest Illiopolis, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.1 miles away.

measured now3 instruments

DecaturDEC

At an airfield/20.2 mi away/679 ft/74 ft above here

temp, wind, gust, visibility, precip, pressure

Rank399of 1,393

measured daily2 instruments

Illiopolis 4.2 NEIL-MA-5

In a volunteer observer's own ground/4.1 mi away/597 ft/8 ft below here

precip, snowfall, snow depth

Rank-

BuffaloBUFI2

At a cooperative observer's station/9.0 mi away/597 ft/8 ft below here

snowfall, snow depth, precip, high, low

Rank1,103of 1,393

Station report

The weather at Decatur, drawn

The nearest airport reporting now, 20.2 mi from Illiopolis, Illinois. From its report of Oct 16, 2026, 3:31 AM local time: 3 of its 6 sheets.

The sky

Scattered at 2,600 ft, scattered at 3,500 ft, overcast at 11,000 ft; the ceiling is 11,000 ft; visibility 10 mi or more.

Section of the sky over Decatur, height above the station to scale: scattered cloud with its base at 2,600 feet, scattered cloud with its base at 3,500 feet, overcast cloud with its base at 11,000 feet, the ceiling at 11,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DECFIG. A THE SKY OVER DECATURSECTION, 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 STATION02,5005,0007,50010,00012,50015,00017,500ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 11,000 FTOVERCAST, 8 EIGHTHS OF THE SKYSCT 3,500 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYSCT 2,600 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 11,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEDecatur, the skySTATION REPORT · ASOS DECTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DEC-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014

The air

53.0 F with a dew point of 48.0 F, 83 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,200 ft up; the lowest cloud reported is at 2,600 ft.

Chart of the air at Decatur: temperature 53.0 degrees Fahrenheit and dew point 48.0, 83 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,200 feet above the station, against the lowest cloud reported at 2,600 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DECFIG. B THE AIR AT DECATURTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00040 F50 F60 FSATURATES 1,200 FT ABOVE THE STATION, AT 46.9 FLOWEST CLOUD REPORTED, SCT 2,600 FTTEMPERATURE 53.0 FDEW POINT 48.0 FSPREAD 5.0 FRELATIVE HUMIDITY 83 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 POINTTITLEDecatur, the airSTATION REPORT · ASOS DECTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DEC-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 17 mph, gusting 25 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 37 mph.

Plan of the wind at Decatur, north up: blowing from 310 degrees, the northwest, at 17 miles an hour, gusting 25; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DECFIG. C THE WIND AT DECATURPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 17 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 25 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEDecatur, the windSTATION REPORT · ASOS DECTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DEC-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Buffalo (BUFI2), 9.0 miles from here, read 15 Oct, 07:00. measured daily

Elsewhere in Illinois

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

Near Illiopolis

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

Near Illiopolis

River and lake gauges