I got three packets of white labs yeast sent to my house from more beer , but was out of town when it arrived. So they sat on my front porch in the box for three days. I paid for the bubble wrap with ice packs but packs were obviously melted and normal outdoor temperature. They were in the shade and it was probably between 60 and 70 for those three days. When I got home I put them in the refrigerator of course. I’m going to make a larger starter anyway but anyone think that is a problem.
If dry it should easily tolerate 70 degree. Liquid I guess would be OK. I always proof my wine yeast with sugar. You could do the same for beer yeast if you make some starter wort.