Detroit weather in September
September in Detroit: nice, a little rain, with clean air — one of the best months to visit.
#1 of 12 months in Detroit · #64 of 604 destinations to visit in September · comfort 90/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Detroit climate normals — September
| Daytime high | 24°C / 74°F | 😎 nice |
|---|---|---|
| Nighttime low | 16°C / 61°F | |
| Feels like (high) | 23°C / 73°F | |
| Rainfall | 55 mm / 2.2 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 14°C / 57°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 12.5 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Detroit in September — FAQ
- Is September a good time to visit Detroit?
- September in Detroit: nice, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Detroit on SeasonMap's comfort score (90/100).
- What is the weather like in Detroit in September?
- In September, Detroit averages a daily high of 23.5°C and a low of 16°C, with about 54.8 mm of rain over roughly 9 rainy days.
- What is the air quality in Detroit in September?
- Detroit has a mean US Air Quality Index of about 45 in September.