Japan Weather and Seasons: What to Expect Month by Month

Spring and Summer

March brings temperatures of 8 to 15 degrees Celsius in Tokyo with cherry blossoms from late March through early April. April warms to 13 to 20 degrees with fresh green foliage and occasional rain. May reaches 18 to 25 degrees, arguably the most pleasant month. June enters tsuyu rainy season in most of Honshu, with three weeks of overcast humidity averaging 22 to 26 degrees. Hokkaido skips tsuyu entirely. July and August bring 28 to 35 degree heat with high humidity, regular afternoon thunderstorms, and the peak of summer festival season.

Okinawa’s rainy season arrives earlier in May, with summer heat and typhoon risk from June through October. The Sea of Japan coast receives less summer heat than the Pacific side but more winter snow. Hokkaido summer rarely exceeds 26 degrees, making it a humidity refuge. Mountain areas above 1,500 meters remain cool through summer, with temperatures 10 to 15 degrees below lowland readings.

Autumn and Winter

September maintains summer heat with typhoon season peaking mid-month. October drops to comfortable 15 to 22 degrees in central Japan with autumn foliage beginning in Hokkaido and mountain areas. November cools to 10 to 17 degrees as foliage reaches Kyoto and Tokyo. December through February ranges from 2 to 10 degrees in Tokyo and Osaka with dry clear skies on the Pacific side, while the Sea of Japan coast and Hokkaido receive massive snowfall. Sapporo averages five meters of cumulative snowfall per winter.

Regional Climate Differences

Japan’s 3,000-kilometer north-south span creates dramatic climate variation. Hokkaido experiences subarctic winters with temperatures reaching minus 20 degrees Celsius in interior areas and heavy snowfall, while Okinawa maintains subtropical warmth year-round with minimum temperatures rarely below 15 degrees even in January. The Sea of Japan coast from Niigata to Tottori receives the heaviest snowfall in the world for a populated region, powered by moisture from the warm Tsushima Current evaporating and dumping on the mountain-facing coast. The Pacific coast from Tokyo to Osaka stays relatively dry and sunny in winter but receives heavier rainfall during the June-July tsuyu rainy season and September typhoon season. The Japanese Alps create a climate divide between the snowy west and the sunny east. Cherry blossom timing varies by three to four weeks between southern Kyushu and northern Hokkaido, and autumn foliage follows the reverse pattern from north to south.

Month-by-Month Overview

January through February brings the coldest temperatures: Tokyo averages 5 to 10 degrees Celsius, Sapporo hovers around minus 5, and Okinawa remains mild at 15 to 20 degrees. March warms rapidly with cherry blossom season arriving late in the month. April and May provide the year’s most comfortable weather at 15 to 25 degrees with low humidity. June brings the tsuyu rainy season to most of Japan except Hokkaido, with three weeks of overcast drizzle and occasional downpours. July and August are hot and humid, with Tokyo and Osaka regularly exceeding 35 degrees and humidity above 80 percent, making air-conditioned spaces essential. September brings typhoon season and lingering heat. October’s cooling temperatures make it one of the best travel months. November brings peak autumn foliage in Kyoto and mild temperatures. December cools rapidly but stays dry and clear across most of the Pacific coast.

Regional Variations

The Sea of Japan coast from Niigata through Tottori receives the world’s heaviest snowfall for a populated region, with some areas exceeding six meters annually. This heavy snow powers world-class skiing but makes winter travel on this coast challenging. Meanwhile, the Pacific coast from Tokyo southward stays relatively dry and sunny through winter. Okinawa operates on an almost entirely different climate calendar, with beach season running May through October and typhoon risk from June through November.

This content is for informational purposes only and reflects independent research. Details may change — verify current information before making travel plans.