April in Kastamonu averages a daily high of 17.2°C with nights around 3.5°C. Expect roughly 11.2 wet days totalling 44.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kastamonu is July–October.
Based on KASTAMONU, TU (1.4km), 1995–2024. 19 years of April data.