Call me conservative
I would not even think about it.
I went for fuel for the garden equipment in winter time around 0°C.
Now it is 20°C here.
Last weeks, I had to relieve pressure form the cans at regular intervals.
The fuel and air in the cans heating up build pressure inside the cans.
And that is while not even leaving the ground.
I dare not imagine what a 8.000 ft density altitude would add to that pressure.
No fuel in cans in my airplane, thank you.