Weather in Detroit in September 2025
Average weather
Average temperature in Detroit in September
The temperature in September is +75°F on average, with a range between a maximum of +90°F during the day and a minimum of +50°F at night.
The average maximum temperature goes down 9% by the end of the month, compared with the beginning of the month, from +79°F to +75°F.
Is Detroit warm or cold in September?
Detroit is typically warm in September.
Maximum temperatures go down compared to the previous month from +81°F to +73°F. The minimum temperature also goes down from +64°F to +57°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Detroit:
Water temperature in Detroit in September
Water in Detroit in September is Fresh. It varies from +64°F to +74°F, with an average of +69°F. This is almost similar to the air temperature, which averages +73°F.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Detroit in September?
Climate in Detroit in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +81°F | +73°F | +61°F | ||||
| Min. temperature | ||||||
| +43°F | +34°F | +25°F | ||||
| Max. temperature | ||||||
| +99°F | +95°F | +88°F | ||||
| Rainfall | ||||||
| 114 mm | 80 mm | 78 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +74°F | +69°F | +59°F | ||||
| Humidity | ||||||
| 71% | 72% | 71% | ||||
| Air pressure | ||||||
| 1015 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 8 | 9 | 7 | ||||
| Cloudy days | ||||||
| 7 | 7 | 10 | ||||
| Rainy days | ||||||
| 12 | 11 | 14 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +81°F in the day, the average maximum temperature lowers to +73°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 114 mm to 80 mm. Humidity rises from 71% to 72%. The average wind speed doesn’t change much during September, staying around 3 m/s. The good news is there are likely to be more sunny days in September, from 8 to 9.
October brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Detroit is gradually increasing during September, going from 2 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Detroit?
Climate Change Over the Years
The climate in Detroit in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1992 (+56°F) and the highest in 1998 (+62°F). The driest year was 1999 with only 460 mm of rainfall, and the wettest year was 2023 with 1977 mm.
FAQ
Is September a good time to visit Detroit?
Can you sunbathe in Detroit in September?
Can you swim in Detroit in September?
Is Detroit rainy in September?
Is it sunny in Detroit in September?
Other cities in USA
Monthly weather in Detroit
Source of the data
For this page, we’ve looked at the typical weather in Detroit, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.