July in Winterthur averages a daily high of 24.4°C with nights around 14.6°C. Expect roughly 14.9 wet days totalling 127.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Winterthur is May–September.
Based on ZUERICH FLUNTERN, SZ (18.1km), 1995–2024. 30 years of July data.