extreme temperatures can cause problems with beer flavor, but i'm talking about leaving it in a hot car in the hot sun for a few days...120F temperatures, prolonged exposure.
but 'skunky' is really attributed to hop oils oxidizing under UV light (the sun). Heiniken is a prime example...green bottles don't block UV light well at all, and when heiniken sits on the shelf for 2-3 weeks under a lot of fluorescent light, the UV rays from those bulbs skunk it.
heat 'damage' would more likely taste like stale beer. i believe it affects stability more than anything.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10