August weather forecast and climate
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 also a moderately hot month, with temperature in the range of an average low of 67.6°F (19.8°C) and an average high of 77.5°F (25.3°C).

Temperature

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.

Humidity

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. Throughout the year, in Chicago, 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: For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 73.9°F (23.3°C).

Daylight

The average length of the day in Chicago is 13.8h.

Sunshine

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

UV index

July and August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. 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 strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the warmest month in Chicago?

August is the warmest month, with an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 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 many days does it rain in August in Chicago?

In Chicago, 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?

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

What is the month with the warmest ocean in Chicago?

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

How warm is the water in August in Chicago?

In Chicago, Illinois, in August, the average water temperature 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, Illinois, the average length of the day in August is 13.8h.

What is the month with the most sunshine in Chicago?

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

How long on average sun shines in August in Chicago?

In Chicago, the average sunshine in August is 10.6h.

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

Months with the highest UV index in Chicago, Illinois, are July and August, with an average maximum UV index of 6.

What is the UV index intensity in August in Chicago?

In Chicago, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays.

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"

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

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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").
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).
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: 13.8h

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

  • Average sunshine in August: 10.6h

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

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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

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).

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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).
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

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

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