Click on a day for an hourly weather forecast
The temperatures in Corner Brook in September are quite cold with temperatures between 8°C and 16°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Corner Brook. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Corner Brook in September 2025.
If you’re planning to visit Corner Brook in the near future, we highly recommend that you review the 14 day weather forecast for Corner Brook before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -10° | 18 | 5 | 9 | 47 mm | Awful | Corner Brook in January |
| February | -4° / -11° | 16 | 4 | 9 | 43 mm | Awful | Corner Brook in February |
| March | -2° / -9° | 13 | 11 | 8 | 36 mm | Awful | Corner Brook in March |
| April | 4° / -3° | 10 | 14 | 5 | 38 mm | Awful | Corner Brook in April |
| May | 10° / 1° | 8 | 22 | 1 | 34 mm | Ok | Corner Brook in May |
| June | 16° / 7° | 7 | 23 | 0 | 40 mm | Good | Corner Brook in June |
| July | 20° / 11° | 8 | 23 | 0 | 42 mm | Good | Corner Brook in July |
| August | 21° / 12° | 9 | 22 | 0 | 45 mm | Good | Corner Brook in August |
| September | 16° / 8° | 9 | 21 | 0 | 53 mm | Ok | Corner Brook in September |
| October | 10° / 4° | 10 | 20 | 1 | 52 mm | Bad | Corner Brook in October |
| November | 4° / -1° | 14 | 12 | 5 | 59 mm | Awful | Corner Brook in November |
| December | -1° / -6° | 16 | 8 | 8 | 47 mm | Awful | Corner Brook in December |