Illinois weather in April
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 59°, nights around 40°, and 3.8 in of rain in a typical April.
| Place | Highs / lows | Wet days | Snow | The short version |
|---|---|---|---|---|
| Chicago | 59° / 40° | 7 | 1.3 in | Wildly unreliable — pack for two entirely different Aprils. |
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.