Nagoya in December

Spring and fall hit the sweet spot. March through May brings cherry blossoms to Nagoya Castle and Tsuruma Park without Tokyo's crowds. October and November deliver perfect weather for walking around, plus fall colors at nearby Korankei Gorge. Summer gets sticky and hot – July averages 28°C with high humidity. But indoor attractions like the Toyota Commemorative Museum work fine, and summer festivals happen in Osu and other districts. Winter stays mild compared to northern Japan, though January can be gray and damp. The city doesn't shut down in any season, unlike some mountain destinations. Just pack accordingly and adjust your outdoor time.