Chicago · AutumnMonth summary
Chicago weather in September
✅ Good
🌡️ Temperature min / max
16°C – 23°C
🌧 Rainy days
32% of days
☀️ Sunshine
11.3h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.8/10
📅 📅 Best month
July (8.2/10)
Quick decision
Should you visit Chicago in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 23°C.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Chicago in September: 23°C and 11.3h of sunshine. Decent, but not the peak.
By trip type
Chicago in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : — No sea access
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 Peak cultural season — museums and sites accessible in good weather conditions Autumn in Chicago is often underrated: 23°C, golden light and declining crowds. An interesting window. Expect rain on 32% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if July (8.2/10) remains theoretically better.
Browse by month
All months for Chicago
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌨️ January | -5°C | 1°C | 31% | 2.1 | 5.6h | 4.0/10 |
| 🌨️ February | -5°C | 2°C | 30% | 2.1 | 8.3h | 4.2/10 |
| 🌦️ March | 0°C | 7°C | 40% | 3.0 | 9.4h | 4.2/10 |
| 🌦️ April | 4°C | 12°C | 46% | 3.3 | 9.9h | 4.9/10 |
| 🌤️ May | 9°C | 18°C | 39% | 4.0 | 11.8h | 7.1/10 |
| 🌤️ June | 16°C | 25°C | 37% | 3.7 | 13.3h | 8.1/10 |
| 🌤️ July | 19°C | 27°C | 40% | 4.8 | 13.3h | 8.2/10 |
| 🌤️ August | 19°C | 26°C | 38% | 3.4 | 12.7h | 8.1/10 |
| 🌤️ September | 16°C | 23°C | 32% | 3.1 | 11.3h | 7.8/10 |
| ⛅ October | 9°C | 17°C | 38% | 4.0 | 9.3h | 7.0/10 |
| 🌫️ November | 2°C | 9°C | 26% | 2.0 | 7.2h | 4.7/10 |
| 🌨️ December | -3°C | 3°C | 28% | 1.9 | 5.8h | 4.0/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Chicago averages 23°C, 32% rainy days and 11.3h of sunshine per day. Overall weather score: 7.8/10.
See methodology →
Comparison
September vs July (best month)
The best month is July (score 8.2/10). Difference:
- 🌡️ Max temperature : +4°C
- 🌧 Rainy days : +8%
- ☀️ Sunshine : +2.0h/day
FAQ
FAQ — Chicago in September
Is September a good time to visit Chicago?
September is an excellent time to visit Chicago (score 7.8/10). With 23°C, 11.3h of sunshine and 32% rain, conditions are very favourable.
What to do in Chicago in September?
With 23°C max and 11.3h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
Activities and tours in Chicago
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