October in Nampa averages a daily high of 18.4°C with nights around 5.4°C. Expect roughly 6.2 wet days totalling 21.7mm. Comfortable conditions for being outdoors all day.
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 October data.