Open Travel Guide
Weather in Illinois

Illinois Weather & Climate Guide 2026

Illinois's climate in numbers — the months that flatter it, the ones to avoid, and what to pack.

Illinois is a Midwestern US state best known for its largest city, Chicago — a global hub of architecture, culture, food, and commerce. From the iconic skyline and world-class museums to Lincoln's historic home in Springfield and the rugged beauty of Shawnee National Forest, Illinois offers an incredibly diverse travel experience.

Best time to visit

Recommendation

Best: Year-round

Avoid: None