Click on a day for an hourly weather forecast
The temperatures in Niagara Falls in September are comfortable with low of 15°C and and high up to 22°C.
You can expect about 3 to 8 days of rain in Niagara Falls 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 Niagara Falls in September 2025.
If you’re planning to visit Niagara Falls in the near future, we highly recommend that you review the 14 day weather forecast for Niagara Falls before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -1° / -6° | 10 | 18 | 3 | 26 mm | Awful | Niagara Falls in January |
| February | 0° / -6° | 10 | 13 | 5 | 28 mm | Awful | Niagara Falls in February |
| March | 5° / -2° | 8 | 21 | 2 | 31 mm | Awful | Niagara Falls in March |
| April | 11° / 3° | 8 | 21 | 1 | 42 mm | Ok | Niagara Falls in April |
| May | 18° / 10° | 7 | 24 | 0 | 37 mm | Good | Niagara Falls in May |
| June | 23° / 15° | 8 | 22 | 0 | 44 mm | Perfect | Niagara Falls in June |
| July | 26° / 19° | 7 | 24 | 0 | 39 mm | Perfect | Niagara Falls in July |
| August | 26° / 19° | 7 | 24 | 0 | 36 mm | Perfect | Niagara Falls in August |
| September | 22° / 15° | 6 | 24 | 0 | 32 mm | Good | Niagara Falls in September |
| October | 15° / 9° | 8 | 23 | 0 | 41 mm | Good | Niagara Falls in October |
| November | 8° / 3° | 6 | 23 | 1 | 27 mm | Ok | Niagara Falls in November |
| December | 3° / -2° | 10 | 18 | 3 | 30 mm | Awful | Niagara Falls in December |