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

The last month of the summer, August, is another warm month in Chicago, Illinois, 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

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).

Humidity

In Chicago, the average relative humidity 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

June through October are months without snowfall.

Ocean temperature

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

In Chicago, the average length of the day is 13.8h.

Sunshine

Months with the most sunshine in Chicago 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 in Chicago. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 in August transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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 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?

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).

What is the temperature in August in Chicago?

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

How much does it rain in Chicago in August?

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?

In Chicago snow does not fall in June through October.

When is the ocean warmest in Chicago?

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

What is the water temperature in August in Chicago?

In Chicago, Illinois, the average seawater temperature in August is 73.9°F (23.3°C). 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.

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

In August, the average length of the day is 13.8h.

What is the month with the most sunshine in Chicago?

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

How many hours of sunshine does Chicago have in August?

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

When is the highest UV index in Chicago?

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

What is the UV index reading in August in Chicago?

In August, the average daily maximum UV index in Chicago is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to the UV radiation.

Average temperature in August
Chicago, IL

Average temperature in August - Chicago, IL
  • Average high temperature in August: 25.3°C

The warmest month (with the highest average high temperature) is August (25.3°C).
The month with the lowest average high temperature is January (-1.3°C).

  • Average low temperature in August: 19.8°C

The month with the highest average low temperature is July (19.9°C).
The coldest month (with the lowest average low temperature) is January (-6.3°C).

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Average pressure in August
Chicago, IL

Average pressure in August - Chicago, IL
  • Average pressure in August: 1015.2mbar

The month with the highest atmospheric pressure is January (1019.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).

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Average wind speed in August
Chicago, IL

Average wind speed in August - Chicago, IL
  • Average wind speed in August: 12.5km/h

The windiest month (with the highest average wind speed) is January (20.1km/h).
The calmest month (with the lowest average wind speed) is July (12.4km/h).

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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: 103mm

The wettest month (with the highest rainfall) is June (124mm).
The driest month (with the least rainfall) is December (42mm).

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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: 0mm

The month with the highest snowfall is February (90mm).
Months with the least snowfall are June, July, August, September and October (0mm).

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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: 23.3°C

The best month for swimming (with the highest average sea temperature) is August (23.3°C).
The coldest month (with the lowest average sea temperature) is February (2.7°C).

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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: 9km

Months with the highest visibility are September and October (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, November and December (9km).

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