Weather in Chicago in October
October in Chicago is cool with average temperatures around 12.4°C (54.3°F). Moderate rainfall of 99mm spread over 11 days.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
15.2°C
59.4°F
Low
9.6°C
49.3°F
Precipitation
99 mm
3.9 inches
~11 rainy days
Conditions
Humidity
77%
Comparison to Adjacent Months
October is 6.8°C cooler than September.
October is 6.3°C warmer than November, 38mm wetter than November.