September in Viareggio averages a daily high of 26.6°C with nights around 15.4°C. Expect roughly 6.3 wet days totalling 70.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Viareggio is April–July.
Based on PISA, IT (23.3km), 1995–2024. 22 years of September data.