Weather StoryAlmanac, microseasons, and the day's weather story.

Illinois Weather

Right now in Illinois
78°F
Overcast

Observed at Chicago (the largest city by population in Illinois, used as a state-wide proxy). For per-city forecasts, see the city grid below.

Climate at a glance

Illinois covers two distinct climate zones across 1,456 cities and towns. Predominantly humid subtropical (59% of cities), with warm-summer humid continental pockets (41%).

The state spans roughly 5.5° of latitude (37.0° N to 42.5° N), from Cairo in the south to Apple River in the north. Chicago is the largest city by population.

ZoneCities%
humid subtropical85658.8%
warm-summer humid continental60041.2%

Microseason · June 1–5 · Predominantly Southeast Subtropical

Fireflies pulse through the magnolias

First fireflies emerge in soft June dusk, blinking above humid lawns and oak groves across the Piedmont and Coastal Plain.

Read this microseason across nine climate regions → · See all 72 microseasons

Microseason content for Illinois is drawn from the Southeast Subtropical corpus (59% of the state's cities sit in this region).

All cities in Illinois

1,456 cities & towns