Cook County (Chicago)
August
Weather in Cook County, Illinois for August 2026
Your guide to Cook County weather in August - trends and predictions
In general, the average temperature in Cook County at the beginning of August is 26.7 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 26.4 °C by the end of August.
Cook County in August brings notable rainfall, with an average of 19 rainy days and a total precipitation of 108.7 mm.
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Temperatures
Rain 🌧️
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12
Dry days
19
Rainy days
0
Snow days
26°/20°
Temperatures
18 km/h
Avg max wind
71 %
Avg humidity
Cook County Weather August
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Temperatures trend during August in Cook County
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August weather in Cook County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Moderate rain at times | 27° /20° | 2.8 mm | 6 | |
| Aug. 2 |  Cloudy | 26° /20° | 0.6 mm | 6 | |
| Aug. 3 | Cloudy | 28° /20° | 2 mm | 6 | |
| Aug. 4 |  Patchy rain possible | 27° /20° | 0.2 mm | 6 | |
| Aug. 5 | Patchy rain possible | 26° /20° | 1.6 mm | 6 | |
| Aug. 6 | Moderate or heavy rain shower | 26° /20° | 5.6 mm | 6 | |
| Aug. 7 | Moderate rain at times | 27° /20° | 4.6 mm | 6 | |
| Aug. 8 | Moderate or heavy rain shower | 28° /20° | 3.6 mm | 6 | |
| Aug. 9 | Moderate or heavy rain shower | 27° /19° | 3.5 mm | 6 | |
| Aug. 10 | Patchy rain possible | 27° /18° | 0.6 mm | 6 | |
| Aug. 11 | Patchy rain possible | 27° /20° | 6.4 mm | 6 | |
| Aug. 12 | Cloudy | 27° /20° | 23.6 mm | 6 | |
| Aug. 13 | Patchy rain possible | 26° /19° | 3 mm | 6 | |
| Aug. 14 |  Partly cloudy | 25° /19° | 5.3 mm | 6 | |
| Aug. 15 | Partly cloudy | 25° /18° | 2.7 mm | 5 | |
| Aug. 16 |  Sunny | 28° /19° | 7.5 mm | 6 | |
| Aug. 17 | Patchy rain possible | 25° /19° | 13.7 mm | 6 | |
| Aug. 18 | Patchy rain possible | 26° /19° | 0.5 mm | 6 | |
| Aug. 19 | Patchy rain possible | 27° /20° | 0.2 mm | 6 | |
| Aug. 20 | Patchy rain possible | 26° /20° | 3.2 mm | 6 | |
| Aug. 21 | Moderate or heavy rain shower | 25° /19° | 0.8 mm | 6 | |
| Aug. 22 | Sunny | 25° /19° | 0.1 mm | 6 | |
| Aug. 23 | Sunny | 29° /19° | 0 mm | 7 | |
| Aug. 24 | Partly cloudy | 29° /19° | 0.3 mm | 7 | |
| Aug. 25 | Cloudy | 27° /19° | 4.1 mm | 6 | |
| Aug. 26 | Cloudy | 26° /19° | 0.6 mm | 6 | |
| Aug. 27 | Patchy rain possible | 28° /19° | 0 mm | 6 | |
| Aug. 28 | Moderate or heavy rain shower | 27° /20° | 5.7 mm | 6 | |
| Aug. 29 | Moderate or heavy rain shower | 27° /19° | 2.5 mm | 6 | |
| Aug. 30 | Cloudy | 25° /19° | 3.4 mm | 6 | |
| Aug. 31 | Partly cloudy | 25° /18° | 0.2 mm | 6 | |
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Important Notice
Our weather forecast for Cook County in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cook County forecast closer to your planned date for the most up-to-date weather information.
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Cook County in August - FAQ
What are the expected maximum and minimum temperatures in Cook County during August?
During August, expect a variety of temperatures with highs around 26° and lows near 20°, suitable for diverse activities and preferences.
How much rainfall should be expected in Cook County during August?
Significant rainfall exceeding 108.7 mm is expected in Cook County during August, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Cook County during August?
The average wind speed in Cook County during August is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Cook County
Explore the daily rainfall trends and prepare for Cook Countys August weather 💧
Typically, Cook County has 19 rainy days in August with a total of 108.7 mm of rainfall.
UV exposure in Cook County during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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