Illinois weather in July
One place stands in for Illinois here — these are Chicago's numbers, not a statewide average.
Based on 1 weather station, in Chicago. One station — Chicago, where Lake Michigan runs the thermostat; downstate summers come hotter, and the far south of the state sees gentler winters.
Chicago & the Lakefront
Highs near 85°, nights around 66°, and 3.7 in of rain in a typical July.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Chicago | 85° / 66° | 6 | Hot, loud, and fully outside — the city's showing-off month. |
Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.