Well, I can tell you which Serge Lutens you shouldn't wear in summer...
and that is MKK
This is my Lutens summer scent!
I like Santal Blanc in the heat.
I suspect Iris Silver Mist would have a cooling effect in the heat but I haven't had a chance to test my theory yet.
Un Bois Vanile might work
I would go with Vetiver Oriental, 5 o'clock and Douce Amere