I worked at UPS for 15 years as a supervisor. Everything that is shipped via UPS is in the heat -- from factory/supplier/seller to delivery. LTL (Less than Truck Load) are in the heat. Even most factory products are in hot truck trailers from start to finish.
I imagine that this is factored into the Use By date.
Having said all this, I would still store as much as I could in a cooler place -- longer shelf life, probably better taste from the can/jar.
Speciality products -- produce, dairy, some medicine, etc. -- is shipped cool. This same line of products would be ones we should be especially careful with when taking from store to home.
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