Rain doesn't stop sports in Japan
Japan's rainy season (June-July) and typhoon season (August-October) can disrupt outdoor plans, but sports don't have to stop. Japan has numerous dome stadiums and indoor arenas for all-weather entertainment.
Dome baseball stadiums
Tokyo Dome (Giants), Vantelin Dome Nagoya (Dragons), Kyocera Dome Osaka (Buffaloes), PayPay Dome Fukuoka (Hawks), Sapporo Dome. All fully enclosed and air-conditioned. Baseball in a dome is a rain-proof guarantee.
Covered soccer stadiums
Noevir Stadium Kobe has full roof coverage. EDION Peace Wing Hiroshima and Panasonic Stadium Suita have high coverage ratios. For outdoor stadiums, bring a poncho — umbrellas are not allowed in seating areas.
Indoor basketball and volleyball
All B.League and SV.League games are played indoors. Okinawa Arena, LaLa arena TOKYO-BAY, and Yokohama BUNTAI are all modern, climate-controlled venues. Basketball is the perfect rainy-day backup plan.
Backup plan strategy
Check the weather forecast the day before. If rain is expected, switch to a dome baseball game or indoor basketball game. Most B.League tickets can be purchased last-minute.
Summary
Japan has enough indoor venues to keep you entertained regardless of weather. Dome stadiums and basketball arenas are your best friends on rainy days.