Detroit weather in September: Detroit, Michigan: normal highs, lows, rain and records for September
Detroit in September has a normal high of 74°F and a normal low of 56°F, a daily mean of 65°F, falling from 79°F on the 1st to 69°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.22 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 13°C, 82 mm of precipitation in September.
- NOAA stationDetroit Metro Airport
- Station IDUSW00094847
- Location42.23°N 83.33°W
- Elevation631 ft (192 m)
- From the center16 miles
- Population645,705
- Jan 32° 19°
- Feb 35° 21°
- Mar 46° 29°
- Apr 59° 39°
- May 70° 50°
- Jun 80° 60°
- Jul 84° 64°
- Aug 81° 63°
- Sep 74° 56°
- Oct 62° 44°
- Nov 49° 34°
- Dec 37° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Detroit in September?
The normal high is 74°F and the normal low 56°F, for a daily mean of 64.9°F. September is 7.4°F cooler than August and 11.9°F warmer than October. September is the 4th warmest month of the year in Detroit and the 6th wettest. Across the month the normal high falls 10°F, from 79°F on September 1 to 69°F on September 30. From one year to the next September's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 62°F and 68°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 32%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 61°F | 31% | 19% |
| September 8 | 77°F | 58°F | 32% | 20% |
| September 15 | 75°F | 56°F | 31% | 19% |
| September 22 | 72°F | 53°F | 31% | 19% |
| September 30 | 69°F | 50°F | 32% | 19% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 79°F | 61°F | 31% | 19% | 13 h 10 min |
| September 2 | 79°F | 60°F | 31% | 19% | 13 h 10 min |
| September 3 | 78°F | 60°F | 31% | 19% | 13 h 10 min |
| September 4 | 78°F | 60°F | 31% | 19% | 13 h |
| September 5 | 78°F | 59°F | 31% | 19% | 13 h |
| September 6 | 78°F | 59°F | 32% | 19% | 13 h |
| September 7 | 77°F | 59°F | 32% | 20% | 13 h |
| September 8 | 77°F | 58°F | 32% | 20% | 12 h 50 min |
| September 9 | 77°F | 58°F | 32% | 20% | 12 h 50 min |
| September 10 | 77°F | 58°F | 31% | 20% | 12 h 50 min |
| September 11 | 76°F | 57°F | 31% | 20% | 12 h 40 min |
| September 12 | 76°F | 57°F | 31% | 20% | 12 h 40 min |
| September 13 | 76°F | 57°F | 31% | 19% | 12 h 40 min |
| September 14 | 75°F | 56°F | 31% | 19% | 12 h 40 min |
| September 15 | 75°F | 56°F | 31% | 19% | 12 h 30 min |
| September 16 | 75°F | 56°F | 31% | 19% | 12 h 30 min |
| September 17 | 74°F | 55°F | 31% | 19% | 12 h 30 min |
| September 18 | 74°F | 55°F | 31% | 19% | 12 h 20 min |
| September 19 | 73°F | 54°F | 31% | 19% | 12 h 20 min |
| September 20 | 73°F | 54°F | 31% | 19% | 12 h 20 min |
| September 21 | 73°F | 54°F | 31% | 19% | 12 h 20 min |
| September 22 | 72°F | 53°F | 31% | 19% | 12 h 10 min |
| September 23 | 72°F | 53°F | 32% | 19% | 12 h 10 min |
| September 24 | 71°F | 52°F | 32% | 19% | 12 h 10 min |
| September 25 | 71°F | 52°F | 32% | 19% | 12 h 10 min |
| September 26 | 71°F | 51°F | 32% | 19% | 12 h |
| September 27 | 70°F | 51°F | 32% | 19% | 12 h |
| September 28 | 70°F | 51°F | 32% | 19% | 12 h |
| September 29 | 69°F | 50°F | 32% | 19% | 11 h 50 min |
| September 30 | 69°F | 50°F | 32% | 19% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 56°FSeptember average
- Precipitation
- 3.22 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 22
- Days at 80°F or more
- 9
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094847; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Detroit in September?
On a given September day the chance of 0.01 inch or more is 31% on average, highest around September 30 (32%). In all, 3.22 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in Detroit, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094847.
How humid and windy is Detroit in September?
At 3 p.m. the normal temperature is 67°F with 52% relative humidity and a dew point of 49°F; at 6 a.m. it is 52°F with 86% humidity. The wind averages 8.1 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 52°F | 48°F | 86% | 6.2 mph | – |
| 9 a.m. | 58°F | 50°F | 75% | 8.6 mph | 35% |
| noon | 65°F | 49°F | 57% | 10.7 mph | 31% |
| 3 p.m. | 67°F | 49°F | 52% | 11.1 mph | – |
| 6 p.m. | 63°F | 49°F | 59% | 9.0 mph | – |
| 9 p.m. | 58°F | 49°F | 72% | 7.1 mph | 42% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094847. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Detroit?
The warmest September temperature on Detroit's official record (since 1874) is 100°F, on September 15, 1939; the coldest is 29°F, on September 23, 1974. The wettest September brought 7.52 in (1986).
The September mean against the 1991-2020 normal of 64.9°F: 2021 66.9°F (+2.0), 2022 66.8°F (+1.9), 2023 66.3°F (+1.3), 2024 68.2°F (+3.3), 2025 67.1°F (+2.2), 2026 67.0°F (+2.1). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.9°F | +2.0°F | 5.43 in |
| 2022 | 66.8°F | +1.9°F | 0.99 in |
| 2023 | 66.3°F | +1.3°F | 2.28 in |
| 2024 | 68.2°F | +3.3°F | 1.22 in |
| 2025 | 67.1°F | +2.2°F | 1.87 in |
| 2026 | 67.0°F | +2.1°F | 3.33 in |
Source: records: ACIS, NWS threaded record DTWthr; recent months: ACIS, station USW00094847. Records and recent months use complete months only.
How does September in Detroit compare across Michigan?
Across the 140 places PlainClimate covers in Michigan, September normal highs run from 65°F in Munising to 76°F in Eau Claire; Detroit's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.