Piopiotahi / Milford Sound is the ultimate wet weather activity! A moody day is a good day, and if you are picturing sunshine and blue skies, you may want to adjust your expectations. It’s possible to go to Piopiotahi / Milford Sound on a blue-bird day, but this spot has some of the highest rainfall levels in the world. In this case, rain is your fantastic friend – it’s the reason you will see lush rainforests and cascading waterfalls! High amounts of rainfall create new and temporary waterfalls and that picturesque cliff face bursting with glacier-fed water.