Chicago, Illinois Weather in October
Typical October in Chicago, Illinois: days around 63°F, nights around 45°F, and the month cools about 9°F from early to late — based on 30-year climate normals (NOAA, 1991–2020), day by day below.
63°Faverage high
45°Faverage low
−9°Fearly vs late October
17°Fday-to-night swing
Early, mid and late October in Chicago
The month split in three — the part of the answer a 30-row table hides.
| Part of October | Avg high | Avg low |
|---|---|---|
| Early October (Oct 1–10) | 67°F | 49°F |
| Mid October (Oct 11–20) | 63°F | 46°F |
| Late October (Oct 21–31) | 58°F | 42°F |
Daylight in Chicago during October
How much light the day gives you — useful for planning what you can still do after work.
11 h 45 minon Oct 1
10 h 24 minon Oct 31
−1 h 21 minlost across October
Day-by-day October normals for Chicago
Long-term daily averages (NOAA 1991–2020) — climate, not a live forecast. For the next 16 days, use the live forecast.
| Day | Avg high | Avg low |
|---|---|---|
| Oct 1 | 69°F | 51°F |
| Oct 2 | 69°F | 50°F |
| Oct 3 | 68°F | 50°F |
| Oct 4 | 68°F | 50°F |
| Oct 5 | 68°F | 49°F |
| Oct 6 | 67°F | 49°F |
| Oct 7 | 67°F | 49°F |
| Oct 8 | 66°F | 48°F |
| Oct 9 | 66°F | 48°F |
| Oct 10 | 65°F | 48°F |
| Oct 11 | 65°F | 47°F |
| Oct 12 | 64°F | 47°F |
| Oct 13 | 64°F | 46°F |
| Oct 14 | 64°F | 46°F |
| Oct 15 | 63°F | 46°F |
| Oct 16 | 63°F | 45°F |
| Oct 17 | 62°F | 45°F |
| Oct 18 | 62°F | 45°F |
| Oct 19 | 61°F | 44°F |
| Oct 20 | 61°F | 44°F |
| Oct 21 | 60°F | 44°F |
| Oct 22 | 60°F | 43°F |
| Oct 23 | 60°F | 43°F |
| Oct 24 | 59°F | 43°F |
| Oct 25 | 59°F | 42°F |
| Oct 26 | 58°F | 42°F |
| Oct 27 | 58°F | 42°F |
| Oct 28 | 57°F | 41°F |
| Oct 29 | 57°F | 41°F |
| Oct 30 | 56°F | 40°F |
| Oct 31 | 56°F | 40°F |
October in Chicago through the years
Real photos taken in Chicago in October by Weathershot app users — different years, same month.
More months: September · November · December · January · Live Chicago forecast
October elsewhere: Atlanta weather in October · Denver weather in October · Miami weather in October · New York weather in October · Phoenix weather in October · Seattle weather in October
Weathershot
The October photos above were taken with Weathershot — it stamps the real weather onto your picture. Snap one in Chicago and it could land on this page.
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Climate normals: NOAA 1991–2020 (GHCND). Photos: Weathershot community, taken on location. © Weathershot · Byss Mobile