In hot weather, I would find or get some shelter up for shade, which could reduce your chance of hyperthermia. You can signal (usually) from a shady spot, or at least have it to retreat to afterwards.

And don't forget that areas that are hot by day can get darned cold at night. And 50F is COLD after being in 100F all day.

Three fires in a triangle in the desert at night is a distress signal to most pilots. They can pass your location to authorities.

Sue