Sendai
Japan · Asia
The water
23 mg/LSoft
Source: GEX MeGreen (Japan Water Works Association statistics) · Published figure. Hardness counts dissolved calcium and magnesium in the water; it is the number your hair meets in the shower.
What soft water does to hair
Lathers easily, rinses clean. Can leave fine hair limp and flyaway; conditioners feel heavier.
The washing routine for Sendai
Wash as you would at home in soft water: there is no mineral load to manage. Go easy on rich conditioners, which can weigh hair down here, and reach for volume at the roots if fine hair sits flat.
Climate, from recent records (Open-Meteo, ERA5 2015-2024): August is the warmest month, averaging 28°C by day, and humidity peaks in July at about 86% on average. In the hot months, sun and sweat do as much damage as the water: shade, a hat and a rinse after swimming carry the routine. In the humid months, frizz is the main event; anti-humidity styling matters more than wash frequency.
Plugs and power for your tools
Sockets: Type A and B. Supply: 100 V, 50 Hz.
Japan runs at 100 V, lower than almost anywhere else: a dryer wound for 230 V only will barely warm up here, and one bought here can burn out on 230 V back home. Check the label for dual voltage (100-240 V) before you plug in.
Plug, voltage and frequency: IEC World Plugs and national standards.
Plan Sendai properly
The trip planner turns this water profile into a wash plan for your hair type, a chosen kit and a packing list, month by month.