Detroit, MI weather in September
September in Detroit: mild, with some rain. Highs 74°F, lows 56°F, about 10 days with rain. A good month for most outdoor plans.
- Normal high
- 74°F
- Normal low
- 56°F
- Wet days
- 10
- 3.2 in total
- Muggy days
- 3
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 79°F | 69°F |
| Normal low | 61°F | 50°F |
| Chance of a wet day | 31% | 32% |
| Sunrise / sunset | 6:57 am / 8:06 pm | 7:28 am / 7:16 pm |
| Daylight | 13.2 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am59°Fdew point 54°F
- 9 am65°Fdew point 55°F
- Noon71°Fdew point 54°F
- 3 pm73°Fdew point 54°F
- 6 pm70°Fdew point 54°F
- 9 pm65°Fdew point 55°F
NOAA hourly normals (local standard time) from Detroit City Airport (6 mi away); average wind 7 mph; clear or few clouds in 50% of daytime hours, mostly cloudy or overcast in 36%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F15 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph7 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more3 of 30
- Wet daysat least 0.01 in of rain or melted snow10 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 3.2 in; a dry September brings about 1.5 in and a wet one about 4.4 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20201998: average high 81°F
- Coolest September1993: average high 67°F
- Wettest September2000: 6.7 in
- Driest September1995: 0.6 in
- Highest reading99°F (September 2, 2011)
- Lowest reading33°F (September 24, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 81°F | 74°F | 61°F |
| Normal low | 64°F | 56°F | 45°F |
| Wet days | 10 | 10 | 11 |
| Comfortable days | 9 | 15 | 10 |
| Daylight | 13.8 h | 12.5 h | 11.1 h |
Highs change by -7°F from August and -13°F into October.
Nearby alternatives in September
- Warmer: Cincinnati, OH236 mi · high 80°F · 9 wet days
How Detroit ranks in September
- Normal high294th warmest of 378 cities; 3rd of 8 in Michigan
- Wet days286th driest of 378
- Comfortable days64th most of 342
What to pack for Detroit in September
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
September has 89 heating degree days and 91 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Detroit in September?
The normal high is 74°F and the normal low is 56°F. From 1991 to 2020 the hottest September reading was 99°F (September 2, 2011).
Does it rain a lot in Detroit in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 3.2 in. The wettest September in 1991-2020 was in 2000 (6.7 in); the driest was in 1995 (0.6 in).
Is September a good time to visit Detroit?
September ranks 3rd of 12 months on our comfort score for Detroit (69 out of 100). It has about 15 comfortable days and about 1 day at 90°F or hotter. The best months are May, June and September.
Where the numbers come from
- Temperature, frost dates and humidity and wind by hour: Detroit City Airport (USW00014822), 5.7 mi NNE of the city center, 626 ft . NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Detroit Metro Airport (USW00094847), 16 mi WSW of the city center, 631 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Flint Bishop Intl Airport (USW00014826), 57 mi NW of the city center, 770 ft (172 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Detroit City Airport (725375-14822), 5.5 mi NNE of the city center, 623 ft . Hourly observations, 1991-2020.