Question

When is body temperature the lowest?

Answer 1

Body temperature is lowest around 4 am and 6 pm.
Hope that helped!!! :DD

Answer 2

Your body temperature is lowest during the night. 
When your asleep your heart rate slows down... So when your heart rate slows down your not pumping a lot of blood through out your system. 
But of course it is pumping enough blood to keep you working and alive. 
So when little blood is being pumped your body temperature cools down. 
** When your deep in your sleep **

This kinda sounds confusing, BUT I hope you get the point 
xD