April in Norwalk averages a daily high of 17.1°C with nights around 3.9°C. Expect roughly 11.1 wet days totalling 113.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Norwalk is August–October.
Based on STAMFORD 5 N, CT US (11.7km), 1995–2024. 21 years of April data.