July in Lynn averages a daily high of 27.3°C with nights around 17.6°C. Expect roughly 9.5 wet days totalling 98.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Lynn is June–September.
Based on MARBLEHEAD, MA US (7.9km), 1995–2024. 27 years of July data.