Weather In Japan In January 2025. If you’re planning to visit japan in the near future, we highly recommend that you review the 14 day weather forecast for. In osaka, japan, in january, during 5.6 rainfall days, 45mm (1.77) of precipitation is typically accumulated.

Insights into temperature, precipitation, and weather trends. While we think the more persistent cold will eventually set up in the pacific northwest and upper midwest, the east can see some cold periods at times later in january and into.