Japan’s rainy season (tsuyu) usually runs mid-June into early July as the Baiu front moves north—humid, showery, and great for hydrangea festivals.

How to cope

  • Breathable layers, compact umbrella, quick-dry shoes
  • Indoor backups: museums, malls, covered shopping streets
  • Hydrangea temple walks on lighter rain days

Southern regions enter tsuyu first; check that year’s meteorological outlook before packing only summer linen.