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.
Temperatures
19° / 10°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
106
mm
Sun Hours
9.3
Hrs
