Click on a day for an hourly weather forecast
The temperatures in Gananoque in September are comfortable with low of 13°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Gananoque 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 Gananoque in September 2025.
If you’re planning to visit Gananoque in the near future, we highly recommend that you review the 14 day weather forecast for Gananoque before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -10° | 11 | 16 | 4 | 26 mm | Awful | Gananoque in January |
| February | -2° / -9° | 10 | 13 | 5 | 27 mm | Awful | Gananoque in February |
| March | 3° / -4° | 9 | 19 | 4 | 28 mm | Awful | Gananoque in March |
| April | 10° / 2° | 8 | 21 | 1 | 41 mm | Ok | Gananoque in April |
| May | 18° / 8° | 6 | 25 | 0 | 33 mm | Good | Gananoque in May |
| June | 22° / 13° | 8 | 22 | 0 | 41 mm | Good | Gananoque in June |
| July | 25° / 17° | 7 | 24 | 0 | 36 mm | Perfect | Gananoque in July |
| August | 25° / 17° | 6 | 25 | 0 | 34 mm | Perfect | Gananoque in August |
| September | 21° / 13° | 6 | 24 | 0 | 33 mm | Good | Gananoque in September |
| October | 14° / 7° | 9 | 23 | 0 | 47 mm | Good | Gananoque in October |
| November | 7° / 1° | 8 | 20 | 2 | 31 mm | Bad | Gananoque in November |
| December | 1° / -4° | 11 | 16 | 4 | 33 mm | Awful | Gananoque in December |