Honolulu
United States · North America
The water
54 mg/LSoft
Source: USGS (Honolulu County estimate via MyTapWater) · 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
Shampoo lathers fast and rinses away clean, with little mineral film left behind. The trade-off is at the roots: fine hair can sit flat and flyaway, and rich conditioners feel heavier than they do at home.
The washing routine for Honolulu
Keep your normal rhythm; soft water asks for no detox routine. If anything, use less conditioner than usual, as it feels heavier here, and give fine hair lift at the roots instead of product through the lengths.
Climate, from recent records (Open-Meteo, ERA5 2015-2024): July is the warmest month, averaging 29°C by day, and humidity peaks in December at about 75% 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.
Plugs and power for your tools
Sockets: Type A and B. Supply: 120 V, 60 Hz.
Full sockets by the sink are standard (the National Electrical Code requires one within 3 feet of each basin, GFCI protected).
A dryer or styler wound for 230 V only will run weak on this supply, and a plug adapter does not change voltage. Check the label for dual voltage (100-240 V) before you travel.
Plug, voltage and frequency: IEC World Plugs and national standards.
Plan Honolulu 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.