They are angled a bit, but SOME water is going to stay in them when washing the bike or getting caught in a heavy downpour, then parking. Though they are slanted some, they are not perpendicular to the road surface, so potentially, water might sit in them until you blow it out going down the road. Nobody will know until some folks get the bikes and ride them a while...but, water has a way of finding it's way into places you don't want it, so the jury remains out on this one. I seriously doubt if HD let a bag with a speaker in it sit out in the weather the equivalent of 60+ days (a relatively low estimate of "average" days on the road or time spent outside the garage)...also, facing up, the speakers themselves are going to get a lot more UV light from the Sun, and that tends to fade and crack some materials. Hopefully, there will be no issues.