I live in a place rather known for its rainy climate and use my H bags almost exclusively for day-to-day activities. My experience is that clemence and togo are just fine in the rain. I even have gotten my clemence bag completely soaked through (it is an evelyn and my playground bag) and it survived without any damage. The togo bags are kellys and birkins and although never getting soaked through, they do get wet without any problems. I have a couple bags in box which have been Docrided and both have been in the rain (not soaked, just with rain dropping on them) without any blistering or other damage - water just beads off. I have even have water splash on my barenia bags and, although I had a heartattack the first time, it simply dried away without a trace.
The leathers are tougher than they might seem.