Chicago Weather in September
Typical September in Chicago: days around 76°F, nights around 57°F — based on 30-year climate normals (NOAA, 1991–2020), day by day below.
76°Faverage high
57°Faverage low
80°Fwarmest normal day
70°Fcoolest normal day
Day-by-day September 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 |
|---|---|---|
| Sep 1 | 80°F | 62°F |
| Sep 2 | 80°F | 62°F |
| Sep 3 | 80°F | 62°F |
| Sep 4 | 80°F | 62°F |
| Sep 5 | 79°F | 61°F |
| Sep 6 | 79°F | 61°F |
| Sep 7 | 79°F | 60°F |
| Sep 8 | 78°F | 60°F |
| Sep 9 | 78°F | 60°F |
| Sep 10 | 78°F | 59°F |
| Sep 11 | 77°F | 59°F |
| Sep 12 | 77°F | 59°F |
| Sep 13 | 77°F | 58°F |
| Sep 14 | 76°F | 58°F |
| Sep 15 | 76°F | 58°F |
| Sep 16 | 76°F | 57°F |
| Sep 17 | 75°F | 57°F |
| Sep 18 | 75°F | 56°F |
| Sep 19 | 74°F | 56°F |
| Sep 20 | 74°F | 55°F |
| Sep 21 | 74°F | 55°F |
| Sep 22 | 73°F | 55°F |
| Sep 23 | 73°F | 54°F |
| Sep 24 | 72°F | 54°F |
| Sep 25 | 72°F | 53°F |
| Sep 26 | 72°F | 53°F |
| Sep 27 | 71°F | 52°F |
| Sep 28 | 71°F | 52°F |
| Sep 29 | 70°F | 52°F |
| Sep 30 | 70°F | 51°F |
September in Chicago through the years
Real photos taken in Chicago in September by Weathershot app users — different years, same month.
More months: October · Live Chicago forecast
Climate normals: NOAA 1991–2020 (GHCND). Photos: Weathershot community, taken on location. © Weathershot · Byss Mobile