Climate averages 1991–2020
Dearborn weather
in September.
A warm, moderately wet month: the 4th warmest and the joint 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Dearborn: daytime highs average 22.6°C and nights cool to about 14.3°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 69 mm of rain on roughly 9 days, which makes September a moderately wet month (the joint 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 32 min on an average September day.
The nearest other city in this atlas is Detroit (11 km away). In September its highs average 22.3°C, about as warm as Dearborn, with 67 mm of rain.
Among the 498 cities listed in the United States, Dearborn ranks joint 424th of 498 for the warmest September highs and joint 209th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Dearborn is 4.3°C cooler than that mean.
From September to October, average highs fall by 7.0°C to 15.6°C, and monthly rainfall stays at 69 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Dearborn climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.4°C-7.6°C | -7.6°C | 64 | 10.0 | 9.59 h |
| February | 1.2°C-7.2°C | -7.2°C | 55 | 8.1 | 10.511 h |
| March | 6.6°C-2.7°C | -2.7°C | 65 | 9.9 | 11.912 h |
| April | 13.5°C3.8°C | 3.8°C | 91 | 11.7 | 13.313 h |
| May | 20.0°C10.5°C | 10.5°C | 93 | 12.6 | 14.615 h |
| June | 25.3°C16.2°C | 16.2°C | 91 | 10.9 | 15.215 h |
| July | 27.5°C18.7°C | 18.7°C | 81 | 11.0 | 14.915 h |
| August | 26.4°C18.1°C | 18.1°C | 81 | 9.9 | 13.914 h |
| September, selected | 22.6°C14.3°C | 14.3°C | 69 | 8.8 | 12.513 h |
| October | 15.6°C8.0°C | 8.0°C | 69 | 9.1 | 11.111 h |
| November | 8.3°C1.6°C | 1.6°C | 70 | 9.1 | 9.810 h |
| December | 2.4°C-3.6°C | -3.6°C | 62 | 9.1 | 9.19 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Detroit in SeptemberUnited States · 11 kmHigh 22.3°C · Low 14.9°C · 67 mm rain
- Livonia in SeptemberUnited States · 15 kmHigh 22.7°C · Low 14.1°C · 69 mm rain
- Southfield in SeptemberUnited States · 17 kmHigh 22.4°C · Low 14.2°C · 70 mm rain
- Westland in SeptemberUnited States · 18 kmHigh 22.6°C · Low 13.9°C · 68 mm rain
- Warren in SeptemberUnited States · 23 kmHigh 22.4°C · Low 14.3°C · 67 mm rain
- Farmington Hills in SeptemberUnited States · 25 kmHigh 22.3°C · Low 13.7°C · 71 mm rain
- Canton (Michigan), United States in SeptemberUnited States · 25 kmHigh 22.6°C · Low 13.7°C · 68 mm rain
- Sterling Heights in SeptemberUnited States · 31 kmHigh 22.3°C · Low 14.6°C · 67 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Dearborn) is explained once on the Dearborn year overview and on the Sources, method and limits page.
Livonia lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.