Japan's main crowd peaks include late March to early April for cherry blossoms, late April to early May for Golden Week, July and August for summer holidays, and October to November for autumn foliage. Australian Christmas and New Year holidays also increase demand, although some businesses close over New Year. Mid-January to February is often quieter in major cities outside ski areas, as is June to early July during the rainy season. Exact cherry-blossom and foliage timing shifts with regional weather each year.

Japan is exposed to earthquakes and volcanic activity throughout the year because of its tectonic setting. June to October is the main window for weather-related hazards: the rainy season can cause flooding and landslides, and typhoon risk is greatest from August to September. Typhoons may disrupt flights, rail services and coastal areas. Northern and mountainous regions face heavy snow and blizzards in winter. November to May is generally outside the main typhoon season, but earthquakes remain unpredictable and no period is risk-free.

Japan has four distinct seasons, with substantial differences between northern and southern regions. March to May brings milder spring weather and cherry blossoms; June to mid-July is rainy season across much of the country. July and August are hot and humid, with typhoons possible later in summer. September to November brings cooler temperatures and autumn foliage. December to February is cold, with heavy snowfall in Hokkaido and mountain areas. Spring and autumn are generally comfortable for sightseeing, but also attract high visitor demand.

Hotel prices often peak in late March and early April for cherry blossoms, during Golden Week in late April and early May, and in October and November for autumn foliage. July and August can also be expensive in major cities and resort areas. Ski destinations have a separate winter peak, especially around Christmas, New Year and February holidays. June to early July can offer better value in many cities because of rainy-season weather, while mid-January to February may be cheaper outside ski regions and major holiday dates.