Illinois weather in August
Considering a trip to Illinois this August and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:
What is the weather like in Illinois in August?
Illinois is a region in the United States of America. August in Illinois generally has temperatures that range from warm to very warm, with precipitation levels ranging from moderate to high. August falls during the summer season.
The average maximum daytime temperatures vary from warm in Roscoe at 24°C to very warm in Metropolis at 31°C. Nighttime temperatures generally drop to 20°C in Metropolis and 12°C in Roscoe.
In August, precipitation varies across different areas. From moderate rainfall in Tuscola with an average of 63 mm to high rainfall in Monee with 138 mm. Meanwhile, Chicago enjoys approximately 280 hours of sunshine, offering a mostly sunny climate that adds a pleasant and vibrant feel to the month.
For specific regional insights in Illinois for August, refer to the map provided below. For an in-depth overview of the yearly weather conditions, do visit our Illinois climate page.
Where to go in Illinois in August
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Popular destinations in Illinois
What is the weather like in August for the 5 most popular destinations in Illinois?
Average weather in Chicago
In August Chicago generally has high temperatures with maximum daytime temperatures around 28°C, minimum nighttime temperatures around 18°C and high monthly rainfall. So on average the conditions are pleasant that month.
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Average weather in Schaumburg
In August Schaumburg generally has high temperatures with maximum daytime temperatures around 28°C, minimum nighttime temperatures around 17°C and high monthly rainfall. So on average the conditions are pleasant that month.
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Average weather in Rosemont
In August Rosemont generally has high temperatures with maximum daytime temperatures around 28°C, minimum nighttime temperatures around 18°C and high monthly rainfall. So on average the conditions are pleasant that month.
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Average weather in Joliet
In August Joliet generally has high temperatures with maximum daytime temperatures around 28°C, minimum nighttime temperatures around 17°C and high monthly rainfall. So on average the conditions are pleasant that month.
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Average weather in Naperville
In August Naperville generally has high temperatures with maximum daytime temperatures around 28°C, minimum nighttime temperatures around 17°C and high monthly rainfall. So on average the conditions are pleasant that month.
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Is your destination not in the list? Have a look at other destinations in Illinois, in the United States of America.
Is August the best time to visit Illinois?
In our opinion, August is a good time to visit Illinois with overall pleasant weather in Chicago.
Generally speaking, September provides perfect weather in Chicago. The weather in January, February, March, November and December, on the other hand, tends to be poor.
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.
Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.
Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal climate conditions. Find out where to go with our weather planner.