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.
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