Chicago Weather in August – Average Temperature and Rainfall
- High
- 26.6°
- Low
- 19.1°
- Rainfall
- 105 mm
- Rainy season
- 12d
- max
- 37.0°
- min
- 11.1°
August
- Early
- 27.1° 32.6 mm
- Mid
- 26.2° 39.7 mm
- Late
- 26.4° 32.7 mm
Summary
The climate figures for Chicago are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 1,145 mm.
The rainy season runs May–October. The wettest month is July with 149.7 mm across 13 rain days; the driest is February at just 58.6 mm.
The hottest month is July (average high 27.1°C) and the coolest is January (0.1°C).
The most comfortable time to visit Chicago is February — less rain and milder heat.
Monthly averages
Common questions
Will it rain in Chicago today?
No. The chance of rain today is only about 26%.
How hot is it in Chicago today?
Between 14°C and 17°C, with a felt maximum of 14°C.
What is the weather in Chicago tomorrow?
Tomorrow: overcast, 12–17°C, with a 6% chance of rain.