August in Lowell averages a daily high of 28.5°C with nights around 15.5°C. Expect roughly 9.7 wet days totalling 96.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Lowell is May–June.
Based on LOWELL, MA US (4km), 1995–2024. 29 years of August data.