Chicago

Illinois Weather in July

Average temperatures, rainfall, sunshine and the best places to visit in Illinois, the United States of America in July.

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Chicago Schaumburg Rosemont Joliet

Planning a trip to Illinois, the United States of America this July? Here's what you need to know about the weather:

What to Expect in Illinois in July

Illinois, the United States of America is a region in the United States of America. July in Illinois generally has temperatures that range from warm to very warm, with precipitation levels ranging from moderate to high. July falls during the summer season.

Temperatures

Based on our climate data spanning from 1990-2020, the average maximum temperature is warm in Roscoe at 26°C (79°F) to very warm in O'Fallon at 31°C (88°F). Nighttime temperatures generally drop to 20°C (68°F) in O'Fallon and 14°C (57°F) in Roscoe. In Illinois, the United States of America, July typically stands out as the hottest month of the year. If you're planning a visit during this time, it would be wise to come prepared. Packing light and breathable summer cloths will ensure you stay comfortable throughout your stay.

For a closer look at conditions across Illinois, the United States of America, refer to the map below.

Precipitation

In July, precipitation varies across different areas. From moderate rainfall in Taylorville with an average of 85 mm (3.3 in) to high rainfall in Galena with 154 mm (6.1 in).

Average sunshine

Several destinations enjoy plenty of sunshine this month. Chicago sees close to 319 hours of sunlight, making it great for sun lovers.

Explore Illinois by month

Pick a month to see the average temperature, rainfall and sunshine in Illinois — and find the best time to visit. (based on Chicago)

January-1°C (30°F) February0°C (32°F) March8°C (46°F) April15°C (59°F) May21°C (70°F) June26°C (79°F) This monthJuly29°C (84°F) August28°C (82°F) September24°C (75°F) October17°C (63°F) November9°C (48°F) December3°C (37°F)
Best Time to Visit Illinois →

Best Places to Visit in Illinois in July

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Illinois.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Illinois

What is the weather like in July for some of the most popular destinations in Illinois, the United States of America?

Temperature range in Illinois (July)

Precipitation variation in Illinois (July)

Chicago

In July Chicago generally has high temperatures with maximum daytime temperatures around 29°C (84°F), minimum nighttime temperatures around 19°C (66°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« June
July
August »
June
July
August
Max temperature
26°C (79°F)
29°C (84°F)
28°C (82°F)
Min temperature
16°C (61°F)
19°C (66°F)
18°C (64°F)
Monthly sun hours
311 hours
319 hours
280 hours
Monthly rainfall
126 mm (5 in)
115 mm (4.5 in)
115 mm (4.5 in)
Monthly rainy days
14 days
11 days
11 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Chicago →

Schaumburg

In July Schaumburg generally has high temperatures with maximum daytime temperatures around 29°C (84°F), minimum nighttime temperatures around 17°C (63°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« June
July
August »
June
July
August
Max temperature
27°C (81°F)
29°C (84°F)
28°C (82°F)
Min temperature
15°C (59°F)
17°C (63°F)
17°C (63°F)
Monthly sun hours
311 hours
319 hours
280 hours
Monthly rainfall
124 mm (4.9 in)
116 mm (4.6 in)
121 mm (4.8 in)
Monthly rainy days
14 days
11 days
11 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Schaumburg →

Rosemont

In July Rosemont generally has high temperatures with maximum daytime temperatures around 29°C (84°F), minimum nighttime temperatures around 19°C (66°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« June
July
August »
June
July
August
Max temperature
26°C (79°F)
29°C (84°F)
28°C (82°F)
Min temperature
16°C (61°F)
19°C (66°F)
18°C (64°F)
Monthly sun hours
311 hours
319 hours
280 hours
Monthly rainfall
126 mm (5 in)
116 mm (4.6 in)
115 mm (4.5 in)
Monthly rainy days
14 days
11 days
11 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Rosemont →

Joliet

In July Joliet generally has high temperatures with maximum daytime temperatures around 29°C (84°F), minimum nighttime temperatures around 18°C (64°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« June
July
August »
June
July
August
Max temperature
27°C (81°F)
29°C (84°F)
28°C (82°F)
Min temperature
16°C (61°F)
18°C (64°F)
17°C (63°F)
Monthly sun hours
311 hours
319 hours
280 hours
Monthly rainfall
133 mm (5.2 in)
116 mm (4.6 in)
131 mm (5.2 in)
Monthly rainy days
15 days
12 days
12 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Joliet →

Naperville

In July Naperville generally has high temperatures with maximum daytime temperatures around 29°C (84°F), minimum nighttime temperatures around 17°C (63°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« June
July
August »
June
July
August
Max temperature
27°C (81°F)
29°C (84°F)
28°C (82°F)
Min temperature
15°C (59°F)
17°C (63°F)
17°C (63°F)
Monthly sun hours
311 hours
319 hours
280 hours
Monthly rainfall
123 mm (4.8 in)
106 mm (4.2 in)
112 mm (4.4 in)
Monthly rainy days
14 days
11 days
11 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Naperville →

Is your destination not in the list? Have a look at all destinations in Illinois, in the United States of America.

In our records: the United States of America July extremes

Notable July records observed across cities in the United States of America in our climate database (1976 – 2026). Historic readings can vary in quality, so treat these as illustrative.

  • In our records, the warmest July day in the United States of America reached 51°C (124°F) in Palm Desert on July 28, 1995.

Popular cities in July

Day & night temperatures, rainfall and average weather in Illinois in July.

City Weather Day temp Night temp Rainfall
Chicago 29°C (84°F) 19°C (66°F) 115 mm (4.5 in)
Schaumburg 29°C (84°F) 17°C (63°F) 116 mm (4.6 in)
Rosemont 29°C (84°F) 19°C (66°F) 116 mm (4.6 in)
Joliet 29°C (84°F) 18°C (64°F) 116 mm (4.6 in)
Naperville 29°C (84°F) 17°C (63°F) 106 mm (4.2 in)
Waukegan 27°C (81°F) 18°C (64°F) 91 mm (3.6 in)

Illinois weather in July: frequently asked questions

What is the weather like in Illinois, the United States of America in July?

Illinois, the United States of America typically experiences pleasant weather in July, part of the summer season. Daytime highs in Chicago average around 29°C (84°F), and temperatures drop to about 19°C (66°F) at night.

What is the average temperature in Illinois, the United States of America in July?

Daytime temperatures in Chicago peak at roughly 29°C (84°F) in July, dropping to about 19°C (66°F) overnight.

Does Illinois, the United States of America get a lot of rain in July?

Chicago typically receives notable rainfall in July, about 115 mm (4.5 in) on average across Illinois, the United States of America.

Is July a Good Time to Visit Illinois, the United States of America?

In our opinion, July is a good time to visit Illinois, the United States of America with overall pleasant weather in Chicago.

Generally speaking, the best visiting conditions can be found in September offering mostly perfect weather in Chicago. On the other hand, the months of January, February, March, November and December tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Illinois.

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 travel conditions. Find out where to go with our weather planner.

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