Yes, May marks the beginning of the typhoon season in Japan, which typically runs through October. While the peak activity and most powerful storms generally occur between July and September, it is a grounded meteorological fact that tropical cyclones can and do begin forming in the Western Pacific as early as May. During this early part of the season, typhoons are less frequent and often pass south of the main islands, but they can still bring significant rainfall and high winds to regions like Okinawa and the southern coast of Kyushu. For a 2026 traveler, May is otherwise one of the most pleasant months to visit due to the mild spring temperatures and the lush greenery following the cherry blossom season. A supportive peer tip: although the risk of a major "landfall" in Tokyo or Osaka is statistically lower in May than in August, you should still monitor the Japan Meteorological Agency (JMA) website for any "Tropical Cyclone Information" if you plan to visit the southern islands, as early-season storms can occasionally disrupt ferry and flight schedules.