Last updated: June 24, 2025
In Detroit, United States, the average temperature in September hovers around 20°C (67°F), making it quite pleasant. However, you can experience a range with a minimum of 6°C (43°F) and a maximum of 33°C (91°F). Expect some rain, as 58 mm (2.3 in) of precipitation typically falls over 8 days during this month, with an average humidity of 80% adding to the tropical feel.
In September in Detroit, the average temperature is 20°C (67°F). The maximum can reach 33°C (91°F), and the minimum can be as low as 6°C (43°F). This comfortable climate makes Detroit an ideal destination for travelers seeking pleasant weather and outdoor activities.
In Detroit in September, the precipitation amount is 58 mm (2.3 in) over a span of 8 days.
In Detroit in September, humidity is 80%. With an average temperature of 20°C (67°F), this humidity feels like a warm embrace that can make outdoor activities feel sticky and heavy, potentially draining your energy as you explore.
In Detroit in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Detroit.
UV Risk Categories
Weather in Detroit varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Detroit, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (28°F) | 67 mm (2.6 inches) | 88% | low |
| February Weather | -2°C (29°F) | 68 mm (2.7 inches) | 87% | moderate |
| March Weather | 3°C (37°F) | 72 mm (2.8 inches) | 85% | moderate |
| April Weather | 8°C (47°F) | 90 mm (3.5 inches) | 86% | very high |
| May Weather | 15°C (60°F) | 111 mm (4.4 inches) | 80% | very high |
| June Weather | 21°C (71°F) | 80 mm (3.2 inches) | 80% | very high |
| July Weather | 24°C (76°F) | 86 mm (3.4 inches) | 80% | very high |
| August Weather | 23°C (74°F) | 75 mm (2.9 inches) | 80% | very high |
| September Weather | 20°C (67°F) | 58 mm (2.3 inches) | 80% | very high |
| October Weather | 13°C (56°F) | 99 mm (3.9 inches) | 84% | moderate |
| November Weather | 5°C (41°F) | 82 mm (3.2 inches) | 89% | moderate |
| December Weather | 1°C (34°F) | 59 mm (2.3 inches) | 86% | low |