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Illinois weather today

We follow 390 towns and cities in Illinois, each with NWS, American, European side by side and the days they disagree flagged. Today the three models put highs between 63°F in Waukegan and 75°F in Belleville, and no model gives a 50% or higher chance of rain in any of the 59 places we hold today's forecast for.

Numbers from the forecast run of Saturday, October 3. Open any town for the live, hour-by-hour comparison.

Weather in Illinois' largest cities today

consensus of NWS, American, European, forecast run of Saturday, October 3
CityTodayHigh / lowRain chanceTomorrowModels agree
ChicagoMostly clear65°F / 52°F3%Partly cloudy, 69°FHigh (3°F apart)
AuroraMostly clear66°F / 47°F2%Mostly clear, 69°FHigh (2°F apart)
RockfordMostly clear65°F / 44°F3%Light drizzle, 67°FHigh (3°F apart)
JolietClear67°F / 48°F2%Mostly clear, 70°FHigh (1°F apart)
NapervilleMostly clear66°F / 48°F2%Mostly clear, 69°FHigh
PeoriaClear69°F / 49°F1%Mostly clear, 71°FHigh (1°F apart)
SpringfieldClear73°F / 48°F1%Clear, 75°FHigh (4°F apart)
North PeoriaClear69°F / 48°F1%Mostly clear, 71°FHigh (2°F apart)
ElginMostly clear65°F / 46°F3%Mostly clear, 68°FHigh (1°F apart)
WaukeganMostly clear63°F / 50°F6%Partly cloudy, 67°FHigh (4°F apart)
West TownMostly clear64°F / 52°F3%Partly cloudy, 68°FHigh
ChampaignClear70°F / 47°F1%Clear, 74°FHigh (2°F apart)
Near North SideClear64°F / 53°F3%Partly cloudy, 68°FHigh (1°F apart)
CiceroMostly clear66°F / 50°F3%Partly cloudy, 69°FHigh (1°F apart)
Belmont CraginMostly clear64°F / 51°F3%Partly cloudy, 68°FHigh (1°F apart)
BloomingtonClear69°F / 47°F1%Clear, 72°FHigh (2°F apart)
Arlington HeightsClear65°F / 48°F4%Mostly clear, 68°FHigh (1°F apart)
EvanstonClear63°F / 53°F4%Partly cloudy, 68°FHigh (1°F apart)
SchaumburgClear65°F / 48°F4%Mostly clear, 68°FHigh (1°F apart)
BolingbrookClear66°F / 49°F2%Partly cloudy, 69°FHigh

Rain chance is the highest of the three models. "Models agree" compares their forecast highs, the same confidence rule as on every city page.

Illinois weather alerts and warnings

active National Weather Service watches, warnings and advisories

Checking the National Weather Service for active alerts in Illinois…

Today across Illinois

from the latest model run, Saturday, October 3
Warmest today
74.9°F
Belleville, IL
  1. Springfield, IL72.5°F
  2. Decatur, IL71.4°F
  3. Urbana, IL70.1°F
  4. Bloomington, IL69.0°F
Coldest low today
44.0°F
Rockford, IL
  1. DeKalb, IL44.7°F
  2. Elgin, IL46.3°F
  3. Normal, IL46.5°F
  4. Urbana, IL46.6°F
Windiest
9 mph
DeKalb, IL
  1. Waukegan, IL8 mph
  2. Lincoln Park, IL8 mph
  3. Urbana, IL8 mph
  4. Rockford, IL8 mph

Warmest and coldest use the average of NWS, American, European. "Rain most certain" ranks by the lowest chance among the models that give one (at least two), so a place only makes the list when they agree, and only from 30%. One place per area, so the list spreads across the state.

The past week across Illinois

analysed, the seven days September 22 to September 28
Warmest
79.5°F
Metropolis, IL
  1. Carmi, IL77.3°F
  2. Mount Carmel, IL77.2°F
  3. Carbondale, IL77.1°F
  4. Olney, IL77.1°F
Coolest
64.9°F
Chicago, IL
  1. Waukegan, IL68.9°F
  2. Aurora, IL69.6°F
  3. Woodstock, IL70.4°F
  4. Rockford, IL70.5°F
Sunniest
80%
Chicago, IL
  1. Waukegan, IL79%
  2. Woodstock, IL79%
  3. Aurora, IL78%
  4. DeKalb, IL78%
Least wind
4 mph
Carbondale, IL
  1. Jerseyville, IL4 mph
  2. Chester, IL4 mph
  3. Belleville, IL5 mph
  4. Metropolis, IL5 mph
Windiest
9 mph
Chicago, IL
  1. Champaign, IL8 mph
  2. Charleston, IL8 mph
  3. Danville, IL8 mph
  4. Waukegan, IL8 mph

Estimates from NASA POWER (GEOS-IT weather analysis, FLASHFlux satellite sunlight), not forecasts or station readings. Warmest and coolest are the average daily high. "Sunniest" is the sunlight that reached the ground as a share of what a clear sky would give at that latitude and date (FAO-56 clear-sky formula, approximate). Each value covers an area of about 50 km around the town, so one town per area. Rain is left out because weekly rain estimates differ too much between data sources to rank them honestly. The week ends a few days back because the sunlight data arrives with a delay.

Which forecast is most accurate in Illinois?

Over the last 30 days we graded the models in 122 Illinois cities against the recorded weather. The European model was most accurate in 120, the American in 2 of them. No model wins everywhere, which is why each city page names its own winner.

Chicago: European 86/100Aurora: European 94/100Rockford: European 85/100Joliet: European 91/100Naperville: European 94/100Peoria: European 92/100Springfield: European 94/100North Peoria: European 94/100Elgin: European 96/100Waukegan: European 79/100West Town: European 90/100Champaign: European 92/100

How we grade: the US accuracy scoreboard and our method.

Illinois climate, city by city

Across the 235 Illinois places we hold long-run averages for, typical July highs run from 78°F in Northbrook to 88°F in Centreville, and January highs from 31°F in Rockford to 45°F in Herrin. Edwardsville is the wettest at about 48 in of precipitation a year, Milan the driest at about 31 in.

CityJan highJul highWettest monthRain per year
Chicago34°F80°FJuly45 in
Aurora33°F83°FJuly40 in
Rockford31°F83°FApril34 in
Joliet34°F83°FJuly42 in
Naperville33°F82°FJuly40 in
Peoria36°F84°FJuly34 in
Springfield38°F84°FJuly36 in
North Peoria35°F84°FJuly34 in
Elgin32°F82°FJuly41 in
Waukegan33°F79°FJuly37 in
West Town34°F80°FJuly45 in
Champaign38°F83°FJuly37 in
Near North Side34°F79°FJuly42 in
Cicero34°F82°FJuly47 in
Belmont Cragin34°F82°FJuly44 in

Averages from ERA5 reanalysis, the same source as the climate tables on each city page.

All 390 places in Illinois

every town and city we cover, A to Z

Common questions

What is the weather in Illinois today?
Today the three models put highs between 63°F in Waukegan and 75°F in Belleville, and no model gives a 50% or higher chance of rain in any of the 59 places we hold today's forecast for. Open any town on this page for the live, hour-by-hour comparison.
Where is it warmest in Illinois today?
Belleville has the highest forecast high of the 59 Illinois places we hold today's forecast for, near 75°F. Waukegan is the coolest, near 63°F.
Which weather forecast is most accurate in Illinois?
Over the last 30 days we graded the models in 122 Illinois cities against the recorded weather. The European model was most accurate in 120, the American in 2 of them.
What is the climate like in Illinois?
Across the 235 Illinois places we hold long-run averages for, typical July highs run from 78°F in Northbrook to 88°F in Centreville, and January highs from 31°F in Rockford to 45°F in Herrin. Edwardsville is the wettest at about 48 in of precipitation a year, Milan the driest at about 31 in.

More US weather

All 50 statesWhich forecast is most accurate in the United States?US rain radarAll US cities, A to Z