One of the first summer songs that comes to my mind is Panama by Van Halen. I'm not a huge Van Halen fan, but this song is fun to listen to while cruising down the highway at four miles-an-hour in traffic.
If Van Halen is not your style, there is always Y&T's Summertime Girls. I know I'm going to get crap from Jenn about this, and I don't even like the band, but I always remember this song when the weather gets warm. Nothing to do with the video, I swear, it reminds me of a college more than anything else. There was one guy in our dorms that loved this band and always played this song in his car.
If you want to go old school, you always have Alice Cooper's School's out. I remember playing this quite loud on the stereo on the last day of school, which happened to be the last day that school was going to be open, ever. The lyrics worked perfectly!
How about some Journey? Any Way You Want it works well. It may not be exactly summer related but it is good to play loud with the windows open and some bell bottoms on. Am I right?
Since Sony won't let me embed the video (they suck the fun out of everything, don't they?), here's a link.
Last on my list is an old favorite of mine. I believe I have put this video up before, but I don't care. This was on of my favorite bands when I was a teenager. Here is Night Ranger's (You can still) Rock in America.
I put the live version up since I can't embed the original either. What is wrong with the record companies?
Anything I missed and you want to add?
Go out an enjoy the weather!