Weather In Japan In December 2024. Expect 12°c daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in japan in december. In tokyo, december temperatures tend to be around 12ºc (54°f) in the afternoon and drop to about 5ºc (41°f) in.

In tokyo, december temperatures tend to be around 12ºc (54°f) in the afternoon and drop to about 5ºc (41°f) in. The climate is rather cold in this city in the month of.