I have songs that aren't necessarily about summer, but they remind me of summertime for some reason:
[ame]http://www.youtube.com/watch?v=VL5d0leKh0o[/ame]
[ame]http://www.youtube.com/watch?v=GVgMzKMgNxw[/ame]
[ame]http://www.youtube.com/watch?v=S7D65IomNYY[/ame]
[ame]http://www.youtube.com/watch?v=akiBVlrRvEQ[/ame]
And the whole But Seriously Folks album by Joe Walsh