Chicago Weather in August
United States · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
August in Chicago sees average temperatures ranging from a low of 19.1°C (66.4°F) to a high of 27.1°C (80.8°F), with a mean of 22.9°C (73.2°F). Compared to the annual average of 10.9°C (51.6°F), this month is 12.0°C warmer than the yearly norm. Precipitation averages 103.5mm, making it approximately 10.0mm wetter than the monthly average of 94.0mm. The city receives an average of 11.6 hours of sunshine per day during August, with relative humidity averaging 74.9%. Wind speeds reach an average maximum of 21.8 km/h. For travelers, this month offers a temperature experience in Chicago, with wetter-than-average conditions compared to the rest of the year.
There's something about Chicago in January that reveals the city's true character. I visited during the polar vortex — minus 25°C, Lake Michigan frozen at the edges, and the locals still walked to their neighborhood taverns as if nothing was unusual. The cultural calendar thrives in winter: theaters full, restaurants cozy, museums uncrowded. Summer (June-August) is when Chicago reclaims its lakefront — 25°C, festivals every weekend, the energy electric. I love October: 14°C, the city in autumn colors, and a melancholy knowing winter is coming. Each season reveals a different Chicago.
August vs Adjacent Months
| Metric | July | August | September |
|---|---|---|---|
| Mean Temp | 23.1°C (73.6°F) | 22.9°C (73.2°F) | 19.6°C (67.3°F) |
| Rainfall | 172.5mm | 103.5mm | 98.2mm |
| Sunshine | 11.7 hrs | 11.6 hrs | 9.6 hrs |
| Humidity | 76.4% | 74.9% | 71.9% |
| Wind | 21.9 km/h | 21.8 km/h | 23.6 km/h |
| Rainy Days | 17.6 | 16.8 | 12.4 |
Seasonal Context
August falls in Summer in the Northern Hemisphere. Summer brings the warmest conditions of the year with the longest daylight hours. For travelers visiting Chicago in August, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Chicago in August?
The average temperature in Chicago during August ranges from 19.1°C (66.4°F) to 27.1°C (80.8°F), with a mean of 22.9°C (73.2°F).
How much does it rain in Chicago in August?
Chicago receives an average of 103.5mm of precipitation in August, spread across approximately 16.8 rainy days.
What should I pack for Chicago in August?
Based on August weather data, pack layers including light jackets and t-shirts, plus an umbrella. Rain gear is essential — this month averages 103.5mm of precipitation.
Is August a good time to visit Chicago?
August is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Chicago
Cities with Similar August Climate (Humid Continental)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 41.88°, -87.63°. Timezone: America/Chicago. Last updated: 2026-07-30.