August weather forecast
Chicago, IL

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The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street

Weather in August

August maintains the summer momentum in Chicago, providing locals and visitors with ample sunshine and heat. The weather conditions are similar to July, maintaining high temperatures and favorable conditions for outdoor activities or sightseeing. However, toward the end of the month, there is a subtle drop in temperatures indicating an impending change. Prepare to bid farewell to the peak summer season and embrace the approach of autumn as the city transitions in the late August days.

Temperature

In Chicago, the month of August is known for its highest average temperatures, reaching a high of 77.5°F (25.3°C) and a low of 67.6°F (19.8°C).

Humidity

In August, the average relative humidity in Chicago is 76%.

Rainfall

In Chicago, during August, the rain falls for 17.3 days and regularly aggregates up to 4.06" (103mm) of precipitation. In Chicago, Illinois, during the entire year, the rain falls for 160.2 days and collects up to 36.97" (939mm) of precipitation.

Snowfall

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

Ocean temperature

With an average ocean temperature of 73.9°F (23.3°C), August is the month with the warmest seawater.
Note: When thinking about a swim in 73.9°F (23.3°C) waters, consider your cold tolerance, the day's sunshine, wind, and air temperature. It is a fun fact that Olympic swimmers dive into waters of 77°F (25°C) to 82.4°F (28°C).

Daylight

In August, the average length of the day is 13h and 49min.
On the first day of the month, sunrise is at 5:45 am and sunset at 8:08 pm. On the last day of August, sunrise is at 6:16 am and sunset at 7:25 pm CDT.

Sunshine

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

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 of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In August, a daily UV index of 6 turns into the following recommendations:
Shield from overexposure. Defense against sun-related harm is required. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Stay sun-safe with clothing that is both closely woven and worn loosely. Watch out! Sand and water enhance the UV exposure you receive.
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Frequently asked questions

What is the warmest month in Chicago?

The month of August sees the average highest temperatures in Chicago, reaching 77.5°F (25.3°C) at the peak and 67.6°F (19.8°C) at the low.

What is the usual temperature for Chicago in August?

In August, in Chicago, the average high-temperature is 77.5°F (25.3°C), and the average low-temperature is 67.6°F (19.8°C).

What is the average humidity in August in Chicago?

In August, the average relative humidity is 76%.

How many days does it rain in August in Chicago?

In August, in Chicago, the rain falls for 17.3 days. Throughout August, 4.06" (103mm) of precipitation is accumulated.

When it does not snow in Chicago?

June through October are months without snowfall in Chicago, Illinois.

What is the month with the warmest ocean in Chicago?

August is the month with the warmest seawater in Chicago, Illinois, with an average ocean temperature of 73.9°F (23.3°C).

How warm is the water in August in Chicago?

In Chicago, the average seawater temperature in August is 73.9°F (23.3°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 73.9°F (23.3°C) water may be enjoyable.

How many hours of daylight does Chicago have in August?

The average day length in August in Chicago is 13h and 49min.

What time are sunrise and sunset in August in Chicago?

On the first day of August in Chicago, sunrise is at 5:45 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 6:16 am and sunset at 7:25 pm CDT.

What are the months with the most sunshine in Chicago?

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

How long on average sun shines in August in Chicago?

In August, the average sunshine duration in Chicago 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 in Chicago.

What is the UV index intensity in August in Chicago?

In Chicago, Illinois, the average daily maximum UV index in August is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Chicago, IL

Average temperature in August - Chicago, IL
  • Average high temperature in August: 77.5°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 August: 67.6°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).

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Average pressure in August
Chicago, IL

Average pressure in August - Chicago, IL
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in August
Chicago, IL

Average wind speed in August - Chicago, IL
  • Average wind speed in August: 7.8mph

The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).

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Average humidity in August
Chicago, IL

Average humidity in August - Chicago, IL
  • Average humidity in August: 76%

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

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Average rainfall in August
Chicago, IL

Average rainfall in August - Chicago, IL
  • Average rainfall in August: 4.06"

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

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Average rainfall days in August
Chicago, IL

Average rainfall days in August - Chicago, IL
  • Average rainfall days in August: 17.3 days

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

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Average snowfall in August
Chicago, IL

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

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

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Average snowfall days in August
Chicago, IL

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

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

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Average sea temperature in August
Chicago, IL

Average sea temperature in August - Chicago, IL
  • Average sea temperature in August: 73.9°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).

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Average daylight in August /
Average sunshine in August
Chicago, IL

Average daylight in August / Average sunshine in August - Chicago, IL
  • Average daylight in August: 13h and 5min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in August: 10h and 4min

The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in August
Chicago, IL

Average sunshine days in August - Chicago, IL
  • Average sunshine days in August: 9.8 days

The month with the most sunshine days is December (15.5 days).
The month with the least sunshine days is July (9.3 days).

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Average UV index in August
Chicago, IL

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

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

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Average cloud cover in August
Chicago, IL

Average cloud cover in August - Chicago, IL
  • Average cloud cover in August: 27

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 27).

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Average visibility in August
Chicago, IL

Average visibility in August - Chicago, IL
  • Average visibility in August: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Chicago, Illinois, USA

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