in my experience.. they are some very heavy water sucking plants ...

the usual problem with late afternoon sun combined with heat ... is your ability to deliver the requisite water the plant needs.. before it starts suffering ...

in this case.. i would consider such.. no different than a hosta ... can you grow hosta in that spot???? or even better.. what have you grown there previously ...

it is near impossible.. to answer these shade/sun questions.. and the only proper answer.. is for you to try it ... and let us know..

and had it been those hours of sun at dusk or dawn.. it would be a very different issue.. w/o the associated heat ...

ken

This is my first year having begonias ("Fragrant Inspiration" - Walmart special). I planted several at the edge of a bed that gets full sun on the southwest side of my house - very hot this time of year in SE VA. I have some others in another bed that gets morning sun and mostly shade in the afternoon. The ones in that bed barely came up and are nothing but a few leaves after several months in the ground. The ones in full sun, on the other hand, are doing very well and are covered with blooms.

I don't know anything about your variety of begonia, but I do LOVE the pretty yellow color! Maybe I have a variety that does better in full sun.

That appears to be a tuberous begonia as opposed to the fibrous/waxed begonia.

Early morning and late afternoon sun won't hurt these during the growing season - but they could bake (even with watering in well draining soil) in an open border spot with 4-5 hours of direct sun.

The plant will die back naturally in the late fall or at first frost - whichever comes first. Since it's a tuber, it has to be dug, dried, cleaned, and stored over the winter in the colder zones.

I've used them as a bright spot here and there in the gardens - generally where they will get some AM sun and would otherwise be provided dappled shade by other plants during the bulk of the day. But I'd buy new each year since I've traditionally had bad luck with overwintering and gave up on the practice. Others have wonderful luck.

Good container or hanging basket plant. That yellow is striking - the tuberous types do come in an array of beautiful colors.