I saw some really beautiful rain the other day, but then when it rained later it was totally white, except when I got a funky angle way below my character, in which case I could catch glimpses of the ground and rocks to the side. I was on the road between Hydlaa and the forest. When I entered the forest it was fine. I could also see the entrance to the forest before I got in, though everything around it was still white. That's using an ATI Radeon X800 on Linux with the proprietary ATI-fglrx-8.28.8 drivers, if it matters.
I was impressed during the first bout of showers though. 'Twas a very welcome change.