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

August 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
August is the wettest month in Chicago and registers 4.9" (124.5mm) of precipitation. The sun shines for an average of 13.5 hours daily amid nine days with clear skies. Though August has calm winds, Chicago is prone to rainstorms, which sometimes register more than an inch at a time.
The average temperatures are in the 63°F (17.2°C) to 82°F (27.8°C) zone - days are over 70°F (21.1°C) most of the time but rarely touch 90°F (32.2°C); nights seldom drop below 50°F (10°C).
August sees a large number of tourists visit Chicago, next only to New York, as the city has plenty of attractions and is one of the safest in the United States regarding the weather hazards!
  • Average high temperature in August: 82.1°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in August: 66.2°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (18.2°F).

  • Average humidity in August: 70.7%

The month with the highest relative humidity is December (75.5%).
The month with the lowest relative humidity is May (64.1%).

  • Average rainfall in August: 4"

Wettest months (with the highest rainfall) are May and June (4.1").
The driest month (with the lowest rainfall) is February (1.9").

  • Average rainfall days in August: 9 days

The month with the highest number of rainy days is May (11.4 days).
The month with the lowest number of rainy days is September (8.2 days).

  • Average snowfall in August: 0"

The month with the highest snowfall is January (11.5").
Months with the lowest snowfall are May, June, July, August and September (0").

  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (8.1 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

  • 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).

  • Average daylight in August: 14.8h

The month with the longest days is June (Average daylight: 16.3h).
The month with shortest days is December (Average daylight: 10.2h).

  • Average sunshine in August: 9.1h

The month with most sunshine is June (Average sunshine: 10.4h).
The month with least sunshine is December (Average sunshine: 3.4h).

  • Average UV index in August: 8

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).

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