This weekend will be sunny and, by current standards, hot. As such, I have scanned the taplists for sunshine beer.
One of the best hot weather beers is Weihenstephaner Hefe Weissbier, pouring at Concordia Ale House. A good German Weiss is a damned hard beer to top on a sunny day.
Belgium's answer to Weissebier is witbier, and Hoegaarden's is pouring at Belmont Station.
Another fine choice in this vein is the rare-ish Hair of the Dog Greg, a light squash beer. You can find it at the Green Dragon. Also available, Oakshire's version of the wit style.
If none of these please you, click around my "On Tap" links and find something that does float your boat.