Weather | 21–28°C (70–82°F), wetter, rainy season starts | 25–32°C (77–90°F), humid, rainy season usually fades mid-month | 26–33°C (79–91°F), hottest stretch, heavy heat at night too |
Crowds | Moderate, fewer long-haul visitors | Moderate to high, with spikes around festival dates | High around Obon, fireworks, and summer event weekends |
Atmosphere | Hydrangeas, umbrellas, quieter parks | Fireworks, yukata, lanterns, later evenings | Full summer mode, bon-odori, bigger domestic holiday movement |
Key events | Rainy-season blooms, Sanno Matsuri in early June | Tanabata, Mitama Matsuri, Marine Day, Sumida River Fireworks Festival | Obon, Koenji Awa-Odori, Summer Comiket |
Public holidays | None nationally significant for most travelers after early June festival period | Marine Day on July 20, 2026 | Mountain Day on August 11, plus Obon travel period |
Budget | Softer hotel rates except event weekends | Mid-range overall; riverfront and festival weekends rise | Higher around Obon and major fireworks dates |
Best for | Garden visits, lower-key sightseeing, indoor culture | Night views, festivals, evening food tours, summer city energy | Big festival fans and travelers who do not mind peak heat |
Book early? | Nice to have for top attractions | Yes for fireworks weekend, indoor headline attractions, and sunset/night slots | Yes for Obon week, festivals, and family attractions |
Transport tips | Carry an umbrella and expect slower walking days | Use subway-heavy routes and avoid festival exits right before start time | Start even earlier than July; some domestic travel corridors get busier |