… for Apple Final Cut Pro X
Tip #1552: Add Rain Drops to Your Video
When adding rain, be sure not to show sky or ground unless they look appropriately rainy.
Shooting video in the rain is rarely a pleasant experience. Fortunately, Final Cut offers the ability to add rain later, in post, where things are warm and dry.
Select the clip you want to add rain drops to, then apply Effects > Distortion > Water Pane.
This creates the effect of looking at the scene through a window with rain pouring down.
Fast and very effective.