Click on a day for an hourly weather forecast
The temperatures in Rochester 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 Rochester 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 Rochester in September 2025.
If you’re planning to visit Rochester in the near future, we highly recommend that you review the 14 day weather forecast for Rochester before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -8° | 5 | 4 | 22 | 93 mm | Awful | Rochester in January |
| February | -1° / -7° | 5 | 4 | 20 | 102 mm | Awful | Rochester in February |
| March | 5° / -3° | 9 | 8 | 15 | 105 mm | Awful | Rochester in March |
| April | 12° / 3° | 9 | 14 | 7 | 128 mm | Awful | Rochester in April |
| May | 20° / 9° | 9 | 21 | 1 | 141 mm | Ok | Rochester in May |
| June | 23° / 13° | 9 | 21 | 0 | 156 mm | Good | Rochester in June |
| July | 27° / 16° | 9 | 22 | 0 | 149 mm | Good | Rochester in July |
| August | 26° / 16° | 8 | 23 | 0 | 139 mm | Good | Rochester in August |
| September | 23° / 12° | 7 | 23 | 0 | 114 mm | Good | Rochester in September |
| October | 15° / 7° | 9 | 21 | 1 | 134 mm | Ok | Rochester in October |
| November | 8° / 1° | 7 | 13 | 10 | 92 mm | Awful | Rochester in November |
| December | 2° / -3° | 7 | 6 | 18 | 114 mm | Awful | Rochester in December |