You need to keep an eye on your fuel temperatures when it gets really hot outside and you are doing short sectors....we sometimes uplift additional fuel if we notice the temperatures approaching the limits etc. Of course the trouble here is that even the uplifted fuel can be hot straight out of the ground...have a look at the limitations and procedures on fuel temps.
We also delay turning on our fuel pumps until we are ready for start up...don't know how much heat is generated by them, however engineering seem to think its a good idea...
Enjoy the summer...at least it's not Ramadan
Che