Detroit, Michigan weather in September

Averages from 2021–2025 (150 days of record).

Average high: 75°F
Average low: 59°F
Rainy days: ~8 per month
Total precipitation: 3.0 in
Warmest recorded: 90°F
Coldest recorded: 45°F

Expect September days in Detroit, Michigan to top out around 75°F and cool to about 59°F overnight, with roughly 8 days of measurable rain across the month. In recent years September has ranged from 45°F to 90°F.

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Current Detroit, Michigan forecast → · Historical data by Open-Meteo (ERA5).