They may experience some pretty severe symptoms, such as neurological issues (stargazing, spinning, general weakness), regurgitation in animals that have recently fed, and/or loose stool.
Make sure when you get home they all have access to fresh, cool water, and get temperatures back down to where they should be. Do not dunk them in cold water, or otherwise shock them - just decrease temperatures to a normal range and give them access to water and a cooler area to go.
Only time will tell you how bad the damage ends up being. If you're lucky, the snakes weathered the "hot spell" and are okay. Good luck, let us know how they end up doing.
-Jen
edited to note that 100 degree AMBIENT with all the usual rack/tank heat pads and heat sources on means that the entire area the snake lives in is over 100 degrees, combined with a hot spot that is going to be at least 10 degrees higher than that. Even in the wild during heat waves, they can retreat from the heat into shade or down into burrows where it is cooler. 100 degrees ambient temps for a prolonged period of time is definitely a concern.