Expect mostly cloudy skies with frequent rain showers across central Japan throughout the week, alongside occasional sunny intervals in the northern and southernmost regions. Temperatures will range from mild up north in Sapporo, to warm in central areas like Tokyo, to hot down south in Naha.

From September 9th to 12th, high pressure over northeastern China will extend near the Kuril Islands, while the Pacific High stretches south of Japan. A weather front will stall near eastern and western Japan. On the 13th, the Pacific High's influence will weaken, narrowing the rain area, but the front will remain stalled over eastern and western Japan.

Disaster Prevention Notes: Heavy rain is expected around the 9th in western Japan and the 10th in eastern Japan due to the stalled front and warm, humid air. Depending on the front's strength and moisture levels, warning-level heavy rain is possible, so stay alert to local updates! In Hokkaido, expect mostly cloudy skies with occasional sunny breaks. The Tohoku region, eastern Japan, and western Japan will see mostly cloudy or rainy days. Okinawa and Amami will generally have cloudy skies, with some areas clearing up by the 12th.

Update on Typhoon No. 24 (Krovanh): the storm has weakened into a tropical depression, and weather advisories for it have officially ended.

Japan’s typhoon season runs from May through October, with most activity from July to September. During a typhoon, transit delays and cancellations can be expected. Be sure to stay updated on the latest weather and flight information. For real-time updates on railways and airports, visit LIVE JAPAN's transport information page.

September marks a beautiful transition in Japan, as the intense summer heat begins to soften into the milder, refreshing breezes of early autumn. The countryside turns a stunning golden hue during the rice harvest, and locals celebrate Tsukimi (moon viewing) festivals, gathering to admire the harvest moon and enjoy traditional treats like tsukimi dango.

While the massive summer matsuri wind down, September offers its own thrilling cultural events. Tokyo hosts the highly anticipated September Grand Sumo Tournament, while Osaka comes alive with the high-speed, adrenaline-pumping Kishiwada Danjiri Matsuri. For outdoor enthusiasts, the first week of the month offers the final opportunity to catch the tail end of the Mt. Fuji climbing season before the mountain officially closes to the public.

As the month progresses, nature lovers can head north to Hokkaido or to high-elevation areas in the Japan Alps to witness the very beginning of the country’s spectacular autumn foliage (koyo) season. When it comes to seasonal eating, September is a culinary delight—be sure to savor early autumn flavors like roasted sweet potatoes, chestnuts, freshly harvested Asian pears, and grilled sanma (Pacific saury).

Tokyo starts the week under damp, rainy skies before transitioning into persistently overcast conditions. Lingering, periodic showers will gradually taper off toward the weekend. Daytime highs will briefly spike into the low 30s Celsius (around 86°F–90°F) before settling comfortably in the late 20s Celsius (around 82°F–84°F). Evening lows will remain mild, gently fluctuating between 21°C (70°F) and 24°C (75°F).

Sapporo greets visitors with mostly dry, comfortable conditions. Gentle sunshine will periodically break through mild cloud cover, though rain chances subtly climb toward the end of the week. Daytime highs will remain pleasantly warm, hovering between 22°C (72°F) and 26°C (79°F), while evening temperatures drop from the high 10s Celsius (upper 60s Fahrenheit) down into the crisp lower 10s Celsius (low to mid-50s Fahrenheit).

Sendai’s upcoming weather brings mostly overcast skies with frequent rain opportunities during the first half of the week, before settling into drier, cloudy conditions toward the weekend. Daytime highs will start comfortably in the mid-20s Celsius (mid-70s Fahrenheit), dip slightly into the low 20s Celsius (low 70s Fahrenheit) mid-week, and gradually warm back up. Evening lows will remain cool, hovering between 18°C (64°F) and 21°C (70°F).

Osaka opens the week with steady rainfall and overcast skies, though shower activity will gradually taper off into lighter, passing rains and lingering clouds as the week progresses. Temperatures will start around 28°C (82°F) for daytime highs before subtly nudging upward into the lower 30s Celsius (around 86°F–90°F). Nighttime lows will remain consistently mild around 24°C (75°F) to 25°C (77°F).

Fukuoka opens the week under mostly overcast skies, with passing rain showers growing increasingly frequent as the days progress. Daytime highs will remain consistently warm around 30°C to 32°C (86°F–90°F), while evening temperatures ease slightly from a balmy 27°C (81°F) down to a more comfortable 25°C (77°F).

Naha unfolds with comfortable subtropical warmth this week, keeping daytime highs steadily warm while evening lows remain pleasantly mild. Soft cloud cover dominates the island skies, occasionally breaking to reveal bright sunny spells. Expect a low to moderate chance of passing showers peaking mid-week before tapering off into drier conditions.

Source for forecast and images: Japan Meteorological Agency website (www.jma.go.jp)

Whether you're planning to be in Japan this week or later this year, check out these fun things you can add to your itinerary!