June in Winterthur averages a daily high of 22.9°C with nights around 13°C. Expect roughly 13.8 wet days totalling 124.6mm. 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 June data.