August weather forecast
Chicago, IL

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, the last month of the summer in Chicago, is another warm month, with an average temperature fluctuating between 77.5°F (25.3°C) and 67.6°F (19.8°C).

Temperature

The warmest month is August, with an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 67.6°F (19.8°C).

Humidity

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

Rainfall

In Chicago, Illinois, in August, during 17.3 rainfall days, 4.06" (103mm) of precipitation is typically accumulated. Throughout the year, in Chicago, Illinois, there are 160.2 rainfall days, and 36.97" (939mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 73.9°F (23.3°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 73.9°F (23.3°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

In Chicago, the average length of the day in August is 13h and 49min.
On the first day of the month, sunrise is at 5:44 am and sunset at 8:09 pm. On the last day of August, in Chicago, sunrise is at 6:15 am and sunset at 7:26 pm CDT.

Sunshine

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

UV index

The months with the highest UV index in Chicago are July and August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the warmest month in Chicago?

With an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 67.6°F (19.8°C), August is the warmest month.

What is the temperature in August in Chicago?

In August, in Chicago, Illinois, 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 in Chicago, Illinois, is 76%.

How much does it rain in Chicago in August?

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

When it does not snow in Chicago?

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

What month is the ocean warmest in Chicago?

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

What is the ocean temperature in August in Chicago?

In August, the average ocean temperature in Chicago, Illinois, 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.

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

In Chicago, the average day length in August is 13h and 49min.

What time are sunrise and sunset in August in Chicago?

On the first day of August in Chicago, Illinois, sunrise is at 5:44 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 6:15 am and sunset at 7:26 pm CDT.

What is the month 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 Chicago, Illinois, the average sunshine duration in August 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 August in Chicago?

In August, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
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 49min

The month with the longest days is June (Average daylight: 15h and 11min).
The month with the shortest days is December (Average daylight: 9h and 11min).

  • Average sunshine in August: 10h and 36min

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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