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Illinois United States of America
Temperatures in July
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Temperature in Illinois in July

Illinois is a region in the United States of America. July in has maximum daytime temperatures ranging from high in Roscoe with 26°C to very high temperatures in O'Fallon with 31°C. Nighttime temperatures generally drop to 20°C in O'Fallon and 14°C in Roscoe. In July, it is summer. On average, July is the warmest month of the year in Illinois. So be prepared and pack summer clothes.

What is the temperature of the different cities in Illinois in July?

Discover the typical July temperatures for the most popular locations of Illinois on the map below. Detailed insights are just a click away.

Weather conditions Weather
Temperatures
Precipitation
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Legend very warm warm pleasant moderate cold very cold
Very warm means maximum temperatures above 30°C. Warm: 22°C to 30°C. Pleasant: 18°C to 22°C Moderate: 12°C to 18°C. Cold: 2°C to 12°C. Very cold: lower than 2°C

  • What is the warmest city in July in Illinois?
    • According to our recent database analysis, O'Fallon is the warmest city. It experiences an average maximum daytime temperature of approximately 31°C and rarely drops below 20°C during the night.

  • What is the coldest city in July in Illinois?
    • According to our data, Roscoe holds the title for the coldest city in Illinois in July. It experiences maximum temperatures of approximately 26°C and drops to lows of about 14°C during the night.

  • How much sun does Illinois get in July?
    • Chicago enjoys close to 319 hours of sunlight. This not only brightens the days but also uplifts the atmosphere during the month.

    Interested in more climate information?

    We have much more information about the climate in Illinois. Interested in the weather conditions in a specific month? Select the month below.

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