Click on a day for an hourly weather forecast
The temperatures in Ann Arbor in September are comfortable with low of 13°C and and high up to 23°C.
You can expect about 3 to 8 days of rain in Ann Arbor during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Ann Arbor in September 2025.
If you’re planning to visit Ann Arbor in the near future, we highly recommend that you review the 14 day weather forecast for Ann Arbor before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -8° | 5 | 9 | 17 | 35 mm | Awful | Ann Arbor in January |
| February | -1° / -7° | 4 | 9 | 16 | 38 mm | Awful | Ann Arbor in February |
| March | 6° / -1° | 6 | 18 | 8 | 42 mm | Awful | Ann Arbor in March |
| April | 12° / 4° | 7 | 21 | 3 | 72 mm | Awful | Ann Arbor in April |
| May | 20° / 10° | 7 | 24 | 0 | 72 mm | Ok | Ann Arbor in May |
| June | 24° / 15° | 6 | 24 | 0 | 73 mm | Perfect | Ann Arbor in June |
| July | 27° / 18° | 4 | 27 | 0 | 69 mm | Perfect | Ann Arbor in July |
| August | 26° / 17° | 4 | 27 | 0 | 60 mm | Perfect | Ann Arbor in August |
| September | 23° / 13° | 4 | 26 | 0 | 44 mm | Perfect | Ann Arbor in September |
| October | 16° / 8° | 4 | 27 | 0 | 44 mm | Good | Ann Arbor in October |
| November | 8° / 1° | 4 | 20 | 6 | 34 mm | Bad | Ann Arbor in November |
| December | 2° / -3° | 5 | 14 | 13 | 31 mm | Awful | Ann Arbor in December |