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Well, there is always the possibility they will totally cook if they really overheat. At lesser levels of heat, you may see a diminished hatch rate. But, there are a lot of other variables. Last summer, which was pretty hot in the south and definitely warmer than normal here, I got various batches of quail eggs. I got them from Florida, Texas, Louisiana, and Oregon. The Oregon batch did have the best hatch rate overall, but they also came later, almost Labor Day, when it had cooled off here quite a bit. Hatch rate varied between 25-30% to about 60%, average was probably about 50% give or take.
I look at it this way. Overall, quail eggs are pretty cheap. I would definitely not let the weather stop me, I would just plan on twice as many, roughly, as you hope to hatch, to compensate for all of the issues that shipped eggs involve, not just the weather.