September in Moncton averages a daily high of 20.4°C with nights around 9.1°C. Expect roughly 13.3 wet days totalling 112.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Moncton is June–September.
Based on BUCTOUCHE CDA CS, NB CA (37.7km), 1995–2024. 25 years of September data.