Click on a day for an hourly weather forecast
The temperatures in Brunswick in September are usually low and can range between 11°C and 20°C.
You can expect about 3 to 8 days of rain in Brunswick 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 Brunswick in September 2026.
If you’re planning to visit Brunswick in the near future, we highly recommend that you review the 14 day weather forecast for Brunswick before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / -1° | 9 | 11 | 12 | 73 mm | Awful | Brunswick in January |
| February | 4° / -1° | 7 | 12 | 9 | 54 mm | Awful | Brunswick in February |
| March | 9° / 2° | 7 | 19 | 5 | 57 mm | Awful | Brunswick in March |
| April | 14° / 5° | 5 | 24 | 2 | 42 mm | Ok | Brunswick in April |
| May | 17° / 8° | 5 | 26 | 0 | 89 mm | Good | Brunswick in May |
| June | 21° / 11° | 6 | 24 | 0 | 100 mm | Good | Brunswick in June |
| July | 23° / 13° | 6 | 25 | 0 | 106 mm | Perfect | Brunswick in July |
| August | 24° / 14° | 4 | 27 | 0 | 85 mm | Perfect | Brunswick in August |
| September | 20° / 11° | 4 | 26 | 0 | 61 mm | Good | Brunswick in September |
| October | 14° / 7° | 5 | 25 | 0 | 69 mm | Good | Brunswick in October |
| November | 8° / 4° | 7 | 21 | 2 | 56 mm | Awful | Brunswick in November |
| December | 5° / 1° | 7 | 17 | 7 | 67 mm | Awful | Brunswick in December |