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Chicago in September: weather & travel advice
This month's data profile
Strong month under the current formula
Chicago in September is climatically well suited to city breaks, active holidays and hiking and family holidays. The average daily high is around 22 °C. With about 10 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
80/100 · #1
Warmth
#3
Dryness
#6
Sun
#6
Published best categories: Overall, City break, Active, Family
Chicago · SeptemberPhoto: G B_NZ · CC BY-SA 2.0Climate facts
- Average high
- 22 °C
- Average low
- 16 °C
- Rainy days (est.)
- 10 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 75 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Score |
|---|---|---|---|---|---|---|---|---|
| August | 25 | 20 | 13 | 99 | 6.5 | 77 | 3.4 | 75 |
| September (selected) | 22 | 16 | 10 | 82 | 5.2 | 75 | 4.0 | 80 |
| October | 15 | 10 | 11 | 93 | 3.4 | 76 | 4.9 | 58 |
How do the previous and next months compare?
Baseline: September (80/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | |
|---|---|---|---|---|---|---|---|---|
| August | -5 | +3.1 °C | +3.7 °C | +2.5 | +16.5 mm | +1.3 h | +1.9 % | -0.6 m/s |
| October | -22 | -6.3 °C | -6.5 °C | +0.4 | +10.2 mm | -1.8 h | +1.3 % | +0.9 m/s |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Chicago in September?
The average daily high is around 22 °C, with an average daily low of about 16 °C.
Does it rain a lot in Chicago in September?
The curated estimate is about 10 rainy days per month, not a directly measured long-term average. Total precipitation averages around 82 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Chicago?
By the climate score, June, July, August and September are the strongest months for Chicago. September is one of them.