Monthly climate ·Chicago weather in October
In October, Chicago averages around 17° by day and 9° at night, with 12 rain days a month — about a 37% chance of rain on any given day.
By day
17°C
At night
9°C
Daily rain chance
37%
Rain days a month
12
Monthly precipitation
124 mm
Sunshine hours a day
7.6
Average of 2016–2025 (Open-Meteo archive). Typical climate — not a forecast.
Is October a good time to visit Chicago?
October is cool in Chicago — around 17° by day and 9° at night. Dress in layers; comfortable for city sightseeing.
Every month in Chicago
Frequently asked questions
- What is the weather in Chicago in October?
- In October, temperatures in Chicago average between 9° at night and 17° by day, with 12 rain days a month (average of 2016–2025).
- How much rain falls in Chicago in October?
- Chicago gets about 124 mm of rain in October on average, spread over roughly 12 rain days.
- Is October a good time to visit Chicago?
- October is cool in Chicago — around 17° by day and 9° at night. Dress in layers; comfortable for city sightseeing.