May in Moncton averages a daily high of 15.7°C with nights around 4.5°C. Expect roughly 15.2 wet days totalling 85.7mm. 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. 27 years of May data.