April in Waterbury averages a daily high of 15.8°C with nights around 3.5°C. Expect roughly 10.7 wet days totalling 104.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Waterbury is August–October.
Based on MERIDEN MARKHAM MUNICIPAL AIRPORT, CT US (19.4km), 1995–2024. 24 years of April data.