Where butterflies actually go when it rains
Butterflies hide when it rains* in the same manner they do at night: some hide under large leaves, some crawl under rocks, some seek shelter in garages or under carports, and some crouch on foliage with their wings held in tightly. If it rains quite a bit many of the butterflies become tattered and die. A fun visual for the children.
* Source: Dr. Paul A. Opler. U.S. Geological Survey, Emeritus Scientist.