I'm not very experienced with winter hiking, but hiking in rain, mist and when there is dew on the ground are things I have done a fair amount of. There is no worse feeling than wet socks (especially when its cold). How un-waterproof are the shoes? Make sure you get a pair of gaiters, Trappers sell them for about R80 (everyone else is about R300). They stop water from going in by the shoe laces and at the top where your feet go in (they also stop your shoe laces from getting hooked on bushes, so you don't spend as much time redoing your shoe lace, its also stops debris from getting into your shoes). If they are very un-waterproof, it might be a big problem, you might have to take 8 pairs of socks per day!
When you say they are low cut, do you mean they don't support your ankle? If that is the case, you are taking a huge chance to go hiking in them, I have come very close to twisting my ankle so many times in the berg, but due to my hiking boots being tight around my ankle I was uninjured.