Chicago weather

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Recommended for Illinois

The weather guide for Illinois (Chicago) shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by meteoblue. Find out more about our data sources.

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

When is the best time to go to Chicago?

The best time to go to Chicago is June based on the following average weather conditions.

Maximum daytime temperature = 22 - 30°C [remove]
Daily hours of sunshine = 10 hours or more [remove]

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Max Day Temperature (°C)

  • -1°C maximum daytime temperature in January in Chicago-1
  • 1°C maximum daytime temperature in February in Chicago1
  • 8°C maximum daytime temperature in March in Chicago8
  • 15°C maximum daytime temperature in April in Chicago15
  • 21°C maximum daytime temperature in May in Chicago21
  • 27°C maximum daytime temperature in June in Chicago27
  • 29°C maximum daytime temperature in July in Chicago29
  • 28°C maximum daytime temperature in August in Chicago28
  • 24°C maximum daytime temperature in September in Chicago24
  • 17°C maximum daytime temperature in October in Chicago17
  • 9°C maximum daytime temperature in November in Chicago9
  • 2°C maximum daytime temperature in December in Chicago2

Hours of Sunshine (daily)

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Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

Which is the hottest month in Chicago?

The hottest time of year in Chicago is normally July. Expect maximum daytime temperatures to reach 29°C with moderate heat and humidity.

Which month has the most rain in Chicago?

In terms of rainfall, July is usually the wettest month in Chicago with 100mm on average. There are normally 10 days in July with some rain.

When is it sunniest in Chicago?

The sunniest time of year in Chicago is normally July with bright sunshine on average for 69% of daylight hours; that's 10 hours of sunshine per day.

When is the sea warmest in Chicago?

The sea is usually at its warmest in Chicago in August when the water temperature reaches 21°C.

What is the flight time to Illinois from the UK?

The flight time to Illinois from the UK is typically 8.5 hours.

What is the time difference between Illinois and the UK?

The time difference between Illinois and the UK is GMT-6 hours.

What is the main language spoken in Illinois?

The main language spoken in Illinois is English.

Learn a language for Illinois with Busuu*, Lingoda* and Rocket Languages*.

What is the currency in Illinois?

The currency in Illinois is the US Dollar (USD).

Send money to Illinois with Monito*, Wise* and World Remit*.

Which plugs are used in Illinois?

Illinois uses electrical plug type A + B (120 Volts).

Which side of the road do they drive on in Illinois?

They drive on the right side of the road in Illinois.

Do you need a visa for Illinois?

Yes, UK passport holders do need a visa to enter Illinois.

Check USA visa requirements for all passport holders with VisaHQ* and*.

Compare Chicago weather with the USA

Below the Chicago weather chart shows average maximum daytime temperature for Chicago, Illinois, USA and the USA (Washington).

Maximum daytime temperature (°C)

Chicago, Illinois, USA
USA (Washington)

Metric (°C / mm)  |  Imperial (°F / inches)

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