Click on a day for an hourly weather forecast
The temperatures in New Brunswick in September are usually low and can range between 10°C and 19°C.
You can expect about 3 to 8 days of rain in New 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 New Brunswick in September 2025.
If you’re planning to visit New Brunswick in the near future, we highly recommend that you review the 14 day weather forecast for New Brunswick before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -11° | 6 | 5 | 21 | 135 mm | Awful | New Brunswick in January |
| February | -4° / -11° | 6 | 3 | 21 | 143 mm | Awful | New Brunswick in February |
| March | 0° / -6° | 7 | 6 | 19 | 118 mm | Awful | New Brunswick in March |
| April | 7° / 0° | 10 | 11 | 9 | 120 mm | Awful | New Brunswick in April |
| May | 14° / 5° | 9 | 22 | 1 | 128 mm | Ok | New Brunswick in May |
| June | 20° / 10° | 8 | 22 | 0 | 152 mm | Ok | New Brunswick in June |
| July | 24° / 14° | 7 | 24 | 0 | 128 mm | Good | New Brunswick in July |
| August | 24° / 14° | 6 | 25 | 0 | 112 mm | Perfect | New Brunswick in August |
| September | 19° / 10° | 5 | 25 | 0 | 106 mm | Good | New Brunswick in September |
| October | 12° / 5° | 8 | 22 | 2 | 138 mm | Awful | New Brunswick in October |
| November | 6° / 0° | 8 | 13 | 9 | 151 mm | Awful | New Brunswick in November |
| December | 0° / -6° | 8 | 8 | 16 | 158 mm | Awful | New Brunswick in December |
For a more accurate weather forecast please select a city