Click on a day for an hourly weather forecast
The temperatures in Grand Rapids in September are comfortable with low of 12°C and and high up to 23°C.
You can expect about 3 to 8 days of rain in Grand Rapids 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 Grand Rapids in September 2025.
If you’re planning to visit Grand Rapids in the near future, we highly recommend that you review the 14 day weather forecast for Grand Rapids before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -8° | 5 | 6 | 21 | 57 mm | Awful | Grand Rapids in January |
| February | -1° / -8° | 4 | 6 | 19 | 57 mm | Awful | Grand Rapids in February |
| March | 6° / -2° | 7 | 16 | 9 | 64 mm | Awful | Grand Rapids in March |
| April | 12° / 3° | 8 | 18 | 4 | 95 mm | Awful | Grand Rapids in April |
| May | 19° / 9° | 8 | 24 | 0 | 102 mm | Ok | Grand Rapids in May |
| June | 24° / 14° | 6 | 24 | 0 | 105 mm | Perfect | Grand Rapids in June |
| July | 26° / 16° | 6 | 25 | 0 | 95 mm | Perfect | Grand Rapids in July |
| August | 26° / 15° | 4 | 27 | 0 | 82 mm | Perfect | Grand Rapids in August |
| September | 23° / 12° | 4 | 26 | 0 | 60 mm | Perfect | Grand Rapids in September |
| October | 15° / 7° | 7 | 24 | 1 | 92 mm | Ok | Grand Rapids in October |
| November | 7° / 1° | 6 | 16 | 8 | 50 mm | Bad | Grand Rapids in November |
| December | 1° / -3° | 6 | 9 | 16 | 56 mm | Awful | Grand Rapids in December |