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Climate · Chicago

Chicago in August

Warm and damp, as the days shorten.

Typical weather, averaged over 30 years

August in Chicago is warm: highs near 83°F, lows near 69°F. Rain falls on about three days a week, and the days shorten by 1 hour 12 minutes from the first week to the last.August in Chicago is warm: highs near 28°C, lows near 21°C. Rain falls on about three days a week, and the days shorten by 1 hour 12 minutes from the first week to the last.

High
83°F28°Caverage
Low
69°F21°Caverage
Wet days
3a week · 38% of days
Daylight
13h 48mon average

Is August a good time to visit Chicago?

A good month, just outside Chicago's best months, which run in two parts: June, or September.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How August sits in the year

week by week

Temperature

Highs near 83°F in August, against 35°F to 84°F through the year.Highs near 28°C in August, against 2°C to 29°C through the year.

Chance of a wet day

38% of days in August, against 32% to 43% through the year.

Cloud cover

37% cover in August, against 36% to 63% through the year.

Daylight

13h 48m in August, against 9h 11m to 15h 10m through the year.

Week by week, lightly smoothed, with August shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. July84°29°low 69°low 21°3 wet days a weekRain on about three days a week.
  2. August83°28°low 69°low 21°3 wet days a weekRain on about three days a week.
  3. September77°25°low 63°low 17°2 wet days a weekRain on about two days a week.

Where Chicago sits, in August

America/Chicago
this place
typical high in August 40°F4°C95°F35°C
Sunrise, mid-August
5:58 AMsets 7:53 PM
Above the sea
175 mlow-lying
Latitude
41.9°Nnorthern hemisphere
Nearest of ours
Dubuque259 km west

The land around Chicago, shaded by its typical high in August, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in August

high · low · wet days
See August on the planning mapThe whole year in Chicago

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Chicago. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.