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Ottawa, Illinois

City in LaSalle County, Illinois

Air quality

The air at Ottawa

Index 13, good, led by fine particles. Read at 12 AM from its reporting area, Joliet and Will County (IL), 37 miles off.

13Good
  • Fine particles (PM2.5)13Good-
  • Ozone9Good-

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 50, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Ottawa

0.87 in in the last 24 hours, 0.95 in over the last 3 days, to Fri 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.87in
Last 3 days
0.95in

Visibility

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

Visibility stays 8 miles or more through Sat 7 PM, lowest 9 miles Fri 4 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Ottawa, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.6 miles away.

measured now5 instruments

PeruVYS

At an airfield/16.0 mi away/653 ft/173 ft above here

temp, wind, gust, visibility, precip, pressure

Rank739of 1,393

measured daily2 instruments

Ottawa 0.9 WSWIL-LS-73

In a volunteer observer's own ground/0.6 mi away/481 ft/1 ft above here

precip, snowfall, snow depth

Rank-

Ottawa 4SWOTTI2

At a cooperative observer's station/3.6 mi away/545 ft/65 ft above here

snowfall, snow depth, precip, high, low

Rank776of 1,393

Station report

The weather at Illinois River AT Starved Rock, drawn

The nearest instrument reporting now, 0.9 mi from Ottawa, Illinois. From its report of Oct 15, 2026, 11:59 PM local time: 3 of its 4 sheets.

The wind

From the northwest (321 degrees) at 16 mph: force 4, a moderate breeze on the Beaufort scale.

Plan of the wind at Illinois River AT Starved Rock, north up: blowing from 321 degrees, the northwest, at 16 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 SRDI2FIG. C THE WIND AT ILLINOIS RIVER AT STARVED ROCKPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 321°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 16 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEIllinois River AT Starved Rock, the windSTATION REPORT · DCP SRDI2TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-16IDSR-SRDI2-1DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 558 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.32 inHg and the temperature at 57.0 F; it reports 57.4 F, 0.4 F warmer than standard.

Section from sea level of where Illinois River AT Starved Rock stands in the atmosphere, height to scale: the station 558 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.32 inches of mercury, and temperature, 57.0 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SRDI2FIG. D WHERE ILLINOIS RIVER AT STARVED ROCK STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREILLINOIS RIVER AT STARVED ROCK2 PER CENT OF THE AIR BELOW IT558 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.32 inHgSTANDARD TEMPERATURE HERE57.0 FTEMPERATURE, REPORTED57.4 FTITLEIllinois River AT Starved Rock, the columnSTATION REPORT · DCP SRDI2TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-16IDSR-SRDI2-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 16 the noon sun stands 40 degrees above the horizon at 41.33 N, and the day is 10 h 55 min long. Level ground there takes 64 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Illinois River AT Starved Rock, angles true: on Oct 16 it stands 40 degrees above the horizon, against 72 at the June solstice, 49 at the equinoxes and 25 at the December solstice; the day is 10 h 55 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SRDI2FIG. E THE SUN AT ILLINOIS RIVER AT STARVED ROCKELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 72°EQUINOXES 49°DECEMBER SOLSTICE 25°OCT 16, 40°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 55 MINLEVEL GROUND TAKES 64 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 41.33 N; THE SUN'S DECLINATION -9.1°TITLEIllinois River AT Starved Rock, the sunSTATION REPORT · DCP SRDI2TYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-16IDSR-SRDI2-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Illinois River AT Starved Rock, in 4 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 Ottawa

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

Near Ottawa

River and lake gauges