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September Weather in Detroit, United States

Last updated: June 24, 2025

In Detroit, United States, the average temperature in September hovers around 25°C (78°F), making it a pleasant time for outdoor activities. However, be prepared for temperature fluctuations, with minimums dipping to 10°C (50°F) and highs soaring to 38°C (101°F). Expect 83 mm (3.3 in) of precipitation spread over 7 days, contributing to the region's average humidity of 65%. Don't forget to pack accordingly!

September Temperature in Detroit

In September in Detroit, the average temperature is 25°C (78°F). Maximums can reach 38°C (101°F) and minimums can be as low as 10°C (50°F). This climate makes Detroit an ideal destination for travelers seeking warm weather, but it's advisable to pack layers for the cooler evenings.

September Weather in Detroit: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Detroit, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Detroit, September typically has an average temperature of 25°C (78°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec454758637280838378665450
Data source: Temperature data for Detroit generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Detroit

In Detroit in September, the total precipitation amount is 83 mm (3.3 in) over the course of 7 days.

September Precipitation Trends in Detroit

The chart displays monthly precipitation patterns in Detroit, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Detroit, September typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec9014013620919210770958313766106
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Detroit

In Detroit in September, humidity is 65%. With an average temperature of 25°C (78°F), this humidity feels like a warm, enveloping shawl that makes traveling slightly more strenuous, requiring frequent breaks to stay refreshed and hydrated.

September Average Humidity in Detroit

This chart illustrates the average monthly humidity levels in Detroit, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Detroit is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Detroit

In Detroit in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Detroit.

Maximum UV Index Levels in Detroit for September

The chart shows the monthly maximum UV Index (UVI) for Detroit in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Detroit typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Detroit September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Detroit Compares to Other Months

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.

This table compares monthly weather conditions in Detroit, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)90 mm (3.5 inches)80%moderate
February Weather9°C (48°F)140 mm (5.5 inches)79%high
March Weather14°C (58°F)136 mm (5.3 inches)78%very high
April Weather17°C (63°F)209 mm (8.2 inches)78%very high
May Weather22°C (72°F)192 mm (7.6 inches)81%extreme
June Weather26°C (80°F)107 mm (4.2 inches)78%extreme
July Weather28°C (83°F)70 mm (2.8 inches)73%extreme
August Weather28°C (83°F)95 mm (3.8 inches)66%extreme
September Weather25°C (78°F)83 mm (3.3 inches)65%very high
October Weather19°C (66°F)137 mm (5.4 inches)72%very high
November Weather12°C (54°F)66 mm (2.6 inches)82%high
December Weather10°C (50°F)106 mm (4.2 inches)87%moderate

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