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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the StoryShift weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Chicago’s weather is defined by extremes: bitterly cold winters, humid summers, and a brief, pleasant spring and autumn. The live forecast above shows today’s conditions, but for planning a trip, the key is knowing when to visit and what to pack for the city’s dramatic seasonal shifts.
What are the best months to visit Chicago?
Late spring (May–June) and early autumn (September–October) offer the most comfortable weather, with highs in the low 20s°C (70s°F), lower humidity, and fewer crowds. July and August can be hot and muggy, often exceeding 30°C (86°F), while December through February sees average highs around freezing, with wind chill making it feel much colder. School holidays, particularly in July and August, push hotel prices up, so consider a shoulder-season visit for better value.
What should I pack for Chicago?
Pack layers year-round. In winter (November–March), bring a heavy coat, gloves, hat, and waterproof boots; the wind off Lake Michigan is brutal. Summer (June–August) calls for light clothing, but always have a jacket for air-conditioned interiors and sudden thunderstorms. Spring and autumn require a mix: a medium-weight jacket, an umbrella, and comfortable walking shoes for the city’s sprawling streets. Checking the 10-day forecast before you go is wise.
Frequently asked questions about Chicago weather
Does Chicago use Fahrenheit or Celsius for weather reports?
Both are used, but Fahrenheit is standard on local TV and radio. For UK travellers, the live forecast above and most weather apps let you toggle to Celsius easily. Check our UK weather hub for conversion tips.
How accurate is the Chicago weather 20-day forecast?
Long-range forecasts (beyond 10 days) are general trends, not reliable day-by-day predictions. For trip planning, focus on the weather in Chicago 10 days out, and check the chicago weather radar for real-time storm updates.
Is Chicago weather very different from UK weather?
Yes. Chicago has a continental climate: colder winters than Glasgow, hotter summers than London, and more dramatic swings. While the UK is damp and mild, Chicago is dry in winter and humid in summer. See Birmingham weather for a typical UK comparison.