Click on a day for an hourly weather forecast
The temperatures in Bangor in September are comfortable with low of 10°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Bangor 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 Bangor in September 2025.
If you’re planning to visit Bangor in the near future, we highly recommend that you review the 14 day weather forecast for Bangor before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -10° | 6 | 9 | 15 | 124 mm | Awful | Bangor in January |
| February | -2° / -10° | 7 | 6 | 17 | 116 mm | Awful | Bangor in February |
| March | 3° / -5° | 9 | 9 | 14 | 115 mm | Awful | Bangor in March |
| April | 10° / 1° | 10 | 16 | 5 | 142 mm | Awful | Bangor in April |
| May | 17° / 6° | 8 | 23 | 0 | 130 mm | Ok | Bangor in May |
| June | 22° / 10° | 8 | 22 | 0 | 146 mm | Ok | Bangor in June |
| July | 26° / 14° | 6 | 25 | 0 | 100 mm | Perfect | Bangor in July |
| August | 25° / 13° | 5 | 26 | 0 | 107 mm | Perfect | Bangor in August |
| September | 21° / 10° | 4 | 26 | 0 | 97 mm | Good | Bangor in September |
| October | 14° / 5° | 8 | 23 | 1 | 148 mm | Ok | Bangor in October |
| November | 7° / -1° | 7 | 17 | 6 | 129 mm | Awful | Bangor in November |
| December | 0° / -6° | 9 | 10 | 12 | 170 mm | Awful | Bangor in December |