May in Fredericton averages a daily high of 17.7°C with nights around 5°C. Expect roughly 13.4 wet days totalling 78mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Fredericton is June–September.
Based on FREDERICTON CDA CS, NB CA (4.9km), 1995–2024. 21 years of May data.