April in Nampa averages a daily high of 16.7°C with nights around 3.9°C. Expect roughly 8.9 wet days totalling 30.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Nampa is June.
Based on BOISE AIR TERMINAL, ID US (26.2km), 1995–2024. 30 years of April data.