In a game your cpu and gpu temps will certainly go above 30C so somethings not reporting right. Try occt - it'll keep a log of temps and volts.
okay so I tried that same thing really, peak temps were high 40s but only occasionally and it only gives me a cpu temp, no temps for anything else. Also where are these logs you speak of? I checked my documents but the folder contains nothing? does the free version have logs. I should also mention I'm not running a particularly resource heavy game, I'm playing fallout New Vegas with some graphics mods but have had no problems until recently. My rig also does the same thing with civ 5.