July in Saint-Nazaire averages a daily high of 25.3°C with nights around 14.4°C. Expect roughly 10 wet days totalling 46.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Saint-Nazaire is May–September.
Based on NANTES BOUGUENAIS, FR (48.1km), 1995–2024. 30 years of July data.