For some people rain is not desirable, but if you are in Zion National Park when it rains, consider yourself blessed. The formations of Zion National Park are part of a huge plateau that has been eroded and carved by the constant flow of water.
The tops of most formations are very flat and as rain water gathers on the plateau it quickly accumulates and then forces its way over the edge of the plateau often cascading in dramatic fashion down cliff faces, some of which are one to two thousand feet high.
During light rain their are many areas that just off the road where one can view or even experience the light water flows. However, be mindful not to enter a slot canyon or venture near a high water flow as these areas can be dangerous.
To photograph or shoot video during the rain, you simply need to cover your camera with some plastic or other water resistant material. Remember to bring a soft cloth to wipe the rain drops that may spot your lens from time to time.
View this video of the rains and waterfalls in Zion National Park.
Learn more about Zion National Park.