There are several good months in which to visit Japan, for example January has nice weather and sightseeing spots are not over crowded. New Year is popular but it’s worth noting that many shops, restaurants and tourist attractions are closed for a few days between December 29th and January 4th.
Like January, February is a good month as the weather is usually sunny and dry and sightseeing spots are not very crowded. The downside is the short days, with sunset at around 5:30pm in Tokyo. March brings with it the early signs of flowering plants and trees, yet the weather gets noticeably milder.
April is often considered a pretty time to visit Japan because the cherry blossom season takes place in most regions and the weather is agreeably mild. One of Japan's busiest travel seasons, takes place at the end of April and beginning of May making all areas more bustling. However, the remainder of May calms down and is a lovely time to visit as the flowers and vegetation are lavish, and the temperature is comfortable. That being said, the rainy season typically runs from early May to mid-June so pack your waterproofs.
June is the main month of the rainy season. While it doesn’t rain all day, every day, the weather tends to be more gloomy. July marks the end of the rainy season with it typically drying out by mid-July. However this does make for the most hot and humid month and you will break a sweat by just standing outside.
August is equally hot and humid with higher altitudes being the more comfortable places to spend your days. Many local festivals with fireworks are held in August. September marks typhoon season. Typhoons cause intense bursts of rain and wind that usually last for about 2 days, mainly striking the coasts of Okinawa, Kyushu and Shikoku. Oddly, once the typhoon passes you usually find the weather sunny with crystal clear skies.
October is without a doubt, one of the most pleasant months for traveling to Japan as the weather remains warm, but it’s not humid anymore. November is a also great time to visit Japan, as the weather is comparatively mild and the humidity is dry. The autumn colours are at their peak and are spectacular. Equally, December is a good month for traveling thanks to the generally dry weather conditions.