Yes, the weather in the south can be iffy - Weather is typical "pacific northwest" say up to Southeast Alaska. I have been very lucky down there (about 7 nights on a couple of trips) and have had mostly clear skies and barely a brief rainshower. I also had good weather in Pta Arenas (10c, very windy, clear). I haven't been "on the water" down there but you can expect she'll need to be medicated, and it will be very very cold and windy. I'll be spending another 6 nights in the south (Pto Montt and area) later this month and hope the weather gods continue to shine favorably upon me.