You might find if you inspect the cable closely that the cable type, wire gauge/# of conductors and voltage rating are stamped into the jacket. Sometimes it's so slight that it's easy to miss. I can't say for sure that all EVSE cables are SOOW, but all of the ones I've seen are. It's that very flexible synthetic rubber casing.Thanks for the reassurance, everyone! Looks like the cable should be just fine outside in both rain and sunshine. Since I couldn't trace the cable type as SOOW or SJOOW from the Carolgrene PDFs, I was hoping first-hand experience would trump any written specs.
Home Depot sells it.