When to go
Chicago in September
In September, Chicago averages daytime highs of 22°C and night-time lows of 16°C, with about 86 mm of rain over the month. That makes September the 3rd warmest and the 7th wettest month of the year here. It is one of the most comfortable months to visit.
- Average high
- 22°C
- Average low
- 16°C
- Rainfall
- 86 mm
- Humidity
- 76%
Climate
Chicago weather through the year
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °C | 0 | 0 | 5 | 10 | 15 | 21 | 25 | 25 | 22 | 15 | 9 | 3 |
| Low °C | -5 | -5 | -1 | 4 | 9 | 15 | 20 | 20 | 16 | 10 | 4 | -2 |
| Rain mm | 48 | 54 | 62 | 94 | 117 | 102 | 95 | 105 | 86 | 99 | 61 | 58 |
Where to stay
Popular hotels in Chicago
The Westin Michigan Avenue Chicago
★★★★Hotels5.9 km from centre
8.5
Excellent
The Allegro Royal Sonesta Hotel Chicago Loop
★★★★Hotels4.0 km from centre
8.4
Very good
Hampton Inn Chicago Downtown/Magnificent Mile
★★★Hotels5.5 km from centre
8.2
Very good
Park Hyatt Chicago
★★★★★Hotels5.6 km from centre
9.6
Exceptional
Hyatt Regency Chicago
★★★★Hotels4.8 km from centre
8.7
Excellent
Chicago Marriott Downtown Magnificent Mile
★★★★Hotels5.1 km from centre
8.3
Very good
FAQ
Chicago in September: questions
Is September a good time to visit Chicago?
Yes — September is one of the most comfortable months in Chicago. Expect highs around 22°C and 86 mm of rain (NASA climate averages, 2001–2020).
How hot is Chicago in September?
The average daytime high in Chicago in September is 22°C and the average low is 16°C.
Does it rain in Chicago in September?
Chicago gets about 86 mm of rain in September on average, making it the 7th wettest month. Average humidity is 76%.
How much are hotels in Chicago in September?
Prices depend on dates and availability. Search Chicago for September on book.maqami.co to see live prices; signed-in members save up to 10% versus the guest price.
Prefer to ask an AI assistant?
Connect the free MAQAMI MCP server to ChatGPT, Claude or Cursor and ask: Find hotels in Chicago for 2027-09-15 to 2027-09-17
. It searches live MAQAMI prices and returns a secure checkout link.