Click on a day for an hourly weather forecast
The temperatures in Barrie in September are usually low and can range between 12°C and 20°C.
You can expect about 3 to 8 days of rain in Barrie 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 Barrie in September 2025.
If you’re planning to visit Barrie in the near future, we highly recommend that you review the 14 day weather forecast for Barrie before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -5° / -11° | 5 | 4 | 22 | 71 mm | Awful | Barrie in January |
| February | -4° / -11° | 3 | 4 | 21 | 64 mm | Awful | Barrie in February |
| March | 2° / -5° | 6 | 10 | 15 | 72 mm | Awful | Barrie in March |
| April | 9° / 1° | 8 | 13 | 9 | 113 mm | Awful | Barrie in April |
| May | 16° / 7° | 8 | 23 | 1 | 115 mm | Ok | Barrie in May |
| June | 20° / 12° | 8 | 22 | 0 | 150 mm | Ok | Barrie in June |
| July | 24° / 15° | 8 | 23 | 0 | 161 mm | Good | Barrie in July |
| August | 24° / 16° | 7 | 24 | 0 | 153 mm | Good | Barrie in August |
| September | 20° / 12° | 6 | 24 | 0 | 104 mm | Good | Barrie in September |
| October | 13° / 6° | 9 | 20 | 2 | 128 mm | Awful | Barrie in October |
| November | 5° / 0° | 7 | 12 | 11 | 81 mm | Awful | Barrie in November |
| December | -1° / -5° | 6 | 6 | 19 | 80 mm | Awful | Barrie in December |