Click on a day for an hourly weather forecast
The temperatures in Niagara On The Lake 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 On The Lake 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 On The Lake in September 2025.
If you’re planning to visit Niagara On The Lake in the near future, we highly recommend that you review the 14 day weather forecast for Niagara On The Lake before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -6° | 8 | 7 | 18 | 102 mm | Awful | Niagara On The Lake in January |
| February | -1° / -6° | 7 | 5 | 17 | 109 mm | Awful | Niagara On The Lake in February |
| March | 4° / -2° | 10 | 11 | 10 | 114 mm | Awful | Niagara On The Lake in March |
| April | 10° / 3° | 9 | 17 | 4 | 139 mm | Awful | Niagara On The Lake in April |
| May | 16° / 9° | 8 | 23 | 0 | 147 mm | Ok | Niagara On The Lake in May |
| June | 21° / 14° | 7 | 23 | 0 | 158 mm | Ok | Niagara On The Lake in June |
| July | 25° / 18° | 8 | 23 | 0 | 156 mm | Good | Niagara On The Lake in July |
| August | 25° / 19° | 7 | 24 | 0 | 148 mm | Good | Niagara On The Lake in August |
| September | 22° / 15° | 6 | 24 | 0 | 113 mm | Good | Niagara On The Lake in September |
| October | 15° / 10° | 9 | 21 | 1 | 145 mm | Ok | Niagara On The Lake in October |
| November | 8° / 3° | 8 | 16 | 6 | 101 mm | Awful | Niagara On The Lake in November |
| December | 2° / -1° | 9 | 8 | 15 | 109 mm | Awful | Niagara On The Lake in December |