September · United States
Best time to visit Chicago in September Weather, crowds & prices
Weather in Chicago in September
Average temperature 20°C, 77 mm of rain, about 16 days with 6+ hours of sunshine and 72% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.1/10
Ranked #4 of 12 months
- Avg temp
- 20°C
- Rainfall
- 77 mm
- Humidity
- 72%
- Days with 6h+ sun
- 16
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Chicago scores 8.1/10 for sightseeing and cultural travel - an above-average month (#4 of 12). Expect around 20°C, 77 mm of rain, and roughly 16 days with 6+ hours of sunshine this month.
Lakefront architecture, deep-dish nights, and museum campuses peak May through September.
September in Chicago — reliably good (4th best month)
September averages 20°C (68°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.
Rainfall runs 77 mm, so plan one flexible day in three; you still get about 16 days with 6+ hours of sunshine and 12.3 hours of daylight.
It scores 8.1/10 here, 4th of 12 months, against 8.7/10 in the destination's best month.
Pack light clothing, a hat and real sun protection, a packable rain layer.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Chicago in September?
- In September, Chicago averages 20°C, 77 mm of rain, and about 16 days with 6+ hours of sunshine. Its climate-comfort score is 8.1/10.
- Is September a good time to visit Chicago?
- September earns a 8.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Chicago in September?
- Expect about 77 mm of rain in September. Average humidity is 72% and there are about 16 days with 6+ hours of sunshine.
Curated in Chicago
Tickets & experiences
Things to do in Chicago
Chicago, United States. Live activities and tours from GetYourGuide, matched to this destination.