Chicago weather in October
October in Chicago: cool, rainy, with clean air — a great time to visit.
#7 of 12 months in Chicago · #345 of 604 destinations to visit in October · comfort 73/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Chicago climate normals — October
| Daytime high | 16°C / 61°F | 🙂 cool |
|---|---|---|
| Nighttime low | 10°C / 49°F | |
| Feels like (high) | 14°C / 57°F | |
| Rainfall | 126 mm / 4.9 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 69% | 💧 humid |
| Dew point | 7°C / 44°F | |
| Sunshine | 7.2 h/day | |
| Daylight | 11.1 h | |
| Wind | 23 km/h / 14 mph | |
| Snowfall | 1.7 cm / 0.7 in | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Chicago in October — FAQ
- Is October a good time to visit Chicago?
- October in Chicago: cool, rainy, with clean air — a great time to visit. It ranks #7 of 12 months for Chicago on SeasonMap's comfort score (73/100).
- What is the weather like in Chicago in October?
- In October, Chicago averages a daily high of 16.2°C and a low of 9.6°C, with about 125.7 mm of rain over roughly 12.8 rainy days.
- What is the air quality in Chicago in October?
- Chicago has a mean US Air Quality Index of about 35 in October.
- Does it snow in Chicago in October?
- Chicago sees roughly 1.7 cm of snowfall in October.