Batman shocking him with Metropolis' power supply in Hush is probably the best comic example I can think of (although it's not a case of a supervillain's concentrated-blast-of-superduper-electricity-attack), and while it caused some pain, it barely slowed Clark down enough for Bats to get out of arms reach.
Big time extremes of anything (heat, cold, physical force, electricity, cosmic radiation-whatever, etc.) can cause Superman some pain and add tension to fight scenes and stuff like that, but I wouldn't call them weaknesses anymore than a punch from Darkseid is technically a weakness.
I'm not a big fan of the indestructible costume and I have a fondness for Byrne's old aura explanation, but regardless of whether the suit itself rips or not, I think it would take away from him somewhat if Superman ever uses the costume as armor to protect himself from anything. Anything that the suit can withstand, Superman's body should be able to withstand.