Weather in Chicago: August
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Average day temperature: | 79.9°F |
| Average night temperature: | 68.9°F | |
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Sea water temperature: | 70.2°F |
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Number of sunny days: | 16 days |
| Day length: | 13.2 - 14.4 hours | |
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Number of rainy days: | 5 days |
| Precipitation totals: | 2.4 in. | |
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forecast
| Chicago |
temperature
| Chicago |
Air temperature in August, °F
The highest day temperature during August of 2025 was 91°F. At the same time the lowest night temperature was 57°F. Daily and nightly averages during August were 79.9°F and 68.9°F.
Sea water temperature in Chicago in August, °F
The average sea water temperature in August of 2025 was 73.8°F. The highest and lowest sea temperatures during the month were 77.9°F and 69.1°F.
Mostly all days in August are sunny but cloudy days are also possible.
Precipitation total in August, in.
Precipitation total value in Chicago in August is 2.6 in. Other months of the year show relatively similar values.
The average wind speed value in August is 7.8 mph It makes August one of the least windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in August is: 9.0.
Best time for vacation in Chicago
Chicago on a weather map
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