Click on a day for an hourly weather forecast
The temperatures in Bonners Ferry in September are quite cold with temperatures between 9°C and 19°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Bonners Ferry 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 Bonners Ferry in September 2025.
If you’re planning to visit Bonners Ferry in the near future, we highly recommend that you review the 14 day weather forecast for Bonners Ferry before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -1° / -8° | 14 | 8 | 10 | 110 mm | Awful | Bonners Ferry in January |
| February | -1° / -8° | 13 | 8 | 8 | 80 mm | Awful | Bonners Ferry in February |
| March | 4° / -3° | 13 | 11 | 8 | 109 mm | Awful | Bonners Ferry in March |
| April | 9° / 1° | 11 | 16 | 3 | 86 mm | Awful | Bonners Ferry in April |
| May | 16° / 6° | 7 | 24 | 0 | 77 mm | Ok | Bonners Ferry in May |
| June | 20° / 10° | 8 | 22 | 0 | 68 mm | Ok | Bonners Ferry in June |
| July | 25° / 14° | 3 | 28 | 0 | 17 mm | Perfect | Bonners Ferry in July |
| August | 25° / 14° | 3 | 29 | 0 | 19 mm | Perfect | Bonners Ferry in August |
| September | 19° / 9° | 5 | 25 | 0 | 48 mm | Good | Bonners Ferry in September |
| October | 10° / 2° | 9 | 20 | 2 | 104 mm | Awful | Bonners Ferry in October |
| November | 3° / -4° | 16 | 6 | 9 | 141 mm | Awful | Bonners Ferry in November |
| December | -2° / -8° | 15 | 7 | 10 | 130 mm | Awful | Bonners Ferry in December |