Verdict: Good month
Chicago Weather in October
October is mild-to-cool in Chicago, topping out near 17°C (63°F) — comfortable with a layer on. Expect showers on roughly 12 days of the month — rarely trip-ruining, worth planning around. Overall, October is a solid month to visit Chicago.
Average high
17°C / 63°F
Average low
9°C / 48°F
Rain days
~12
Precipitation
115 mm
What to pack for Chicago in October
- Layers — t-shirts under a light jacket or sweater
- Rain gear is non-negotiable — expect rain on roughly 12 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
October against the rest of the year
Warmest in Chicago: Jul (27°C / 81°F) · Coolest: Jan (1°C / 34°F) · Wettest: Apr (~15 rain days)
1°
-6°
Jan
3°
-6°
Feb
9°
0°
Mar
14°
4°
Apr
19°
10°
May
26°
17°
Jun
27°
19°
Jul
27°
19°
Aug
24°
16°
Sep
17°
9°
Oct
10°
3°
Nov
4°
-2°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)