April in New Haven averages a daily high of 14.8°C with nights around 4.7°C. Expect roughly 10.7 wet days totalling 106.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit New Haven is May–June.
Based on NEW HAVEN TWEED AIRPORT, CT US (6.4km), 1995–2024. 23 years of April data.