Chicago
Illinois, USA
Long-term weather forecast
Long-term weather forecast

July weather forecast and climate
Chicago, IL

An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
July is a warm summer month in Chicago, Illinois, with average temperature fluctuating between 67.8°F (19.9°C) and 77.4°F (25.2°C).

Temperature

In July, the average high-temperature marginally rises, from an agreeable 70.5°F (21.4°C) in June, to a moderately hot 77.4°F (25.2°C). In July, the average low-temperature is 67.8°F (19.9°C).

Humidity

In July, the average relative humidity in Chicago is 78%.

Rainfall

In Chicago, it is raining for 18.5 days, with typically 4.21" (107mm) of accumulated precipitation. Throughout the year, in Chicago, there are 160.2 rainfall days, and 36.97" (939mm) of precipitation is accumulated.

Snowfall

June through October are months without snowfall in Chicago.

Ocean temperature

In Chicago, the average seawater temperature is 70.7°F (21.5°C).
Note: For most, swimming in 70.7°F (21.5°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

The average length of the day in July is 14.9h.

Sunshine

July and August, with an average of 10.6h of sunshine, are months with the most sunshine in Chicago.

UV index

July and August, with an average maximum UV index of 6, are months with the highest UV index in Chicago. A UV Index value of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in July in Chicago?

In Chicago, in July, the average high-temperature is 77.4°F (25.2°C), and the average low-temperature is 67.8°F (19.9°C).

What is the average humidity in July in Chicago?

In Chicago, Illinois, the average relative humidity in July is 78%.

How many days does it rain in July in Chicago?

In July, in Chicago, the rain falls for 18.5 days. Throughout July, 4.21" (107mm) of precipitation is accumulated.

When it does not snow in Chicago?

In Chicago, Illinois, snow does not fall in June through October.

What is the ocean temperature in July in Chicago?

In July, the average ocean temperature is 70.7°F (21.5°C). For swimming, a surface water temperature of 70.7°F (21.5°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

What is the average length of the day in July in Chicago?

In Chicago, Illinois, the average length of the day in July is 14.9h.

What are the months with the most sunshine in Chicago?

Months with the most sunshine are July and August, with an average of 10.6h of sunshine.

How long on average sun shines in July in Chicago?

The average sunshine in July in Chicago, Illinois, is 10.6h.

What is the month with the highest UV index in Chicago?

July and August, with an average maximum UV index of 6, are months with the highest UV index.

How high is the UV index in July in Chicago?

The average daily maximum UV index in July in Chicago is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to the UV radiation.
Average temperature in July - Chicago, IL
  • Average high temperature in July: 77.4°F

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in July: 67.8°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average humidity in July - Chicago, IL
  • Average humidity in July: 78%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall in July - Chicago, IL
  • Average rainfall in July: 4.21"

The wettest month (with the highest rainfall) is June (4.88").
The driest month (with the lowest rainfall) is December (1.65").

Average rainfall days in July - Chicago, IL
  • Average rainfall days in July: 18.5 days

The month with the highest number of rainy days is July (18.5 days).
The month with the lowest number of rainy days is February (5.5 days).

Average snowfall in July - Chicago, IL
  • Average snowfall in July: 0"

The month with the highest snowfall is February (3.54").
Months with the lowest snowfall are June, July, August, September and October (0").

Average snowfall days in July - Chicago, IL
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (10.6 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

Average sea temperature in July - Chicago, IL
  • Average sea temperature in July: 70.7°F

The best month for swimming (with the highest average sea temperature) is August (73.9°F).
The coldest month (with the lowest average sea temperature) is February (36.9°F).

Average daylight in July / Average sunshine in July - Chicago, IL
  • Average daylight in July: 14.9h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).

  • Average sunshine in July: 10.6h

Months with most sunshine are July and August (Average sunshine: 10.6h).
The month with least sunshine is January (Average sunshine: 3.7h).

Average UV index in July - Chicago, IL
  • Average UV index in July: 6

Months with the highest UV index are July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 1).