July in Saint John averages a daily high of 20°C with nights around 12.1°C. Expect roughly 11.7 wet days totalling 80.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Saint John is July–September.
Based on POINT LEPREAU CS, NB CA (38.3km), 1995–2024. 27 years of July data.