Whether it is in a shower or not most of the time it is required. Check with your local building code to be sure. But, to be safe, you might want to have tempered glass.

Why is this even a question? What you can get away with for a nickel cheaper should never be up for question when life safety is on the line.

That should not have to be tempered. I have a window sill about 5’ 5” off the tub floor, I see no danger unless you’re a 7 footer. icwould make your iwn choice and not worry anout being temper shamed.

Where I live (SF Bay Area) tempered glass is required.

From looking at the California State building code which mirrors the IRC code it would be exempt. There can be local codes that are more strict and would overide the IRC code. I would like to know what code in San Fransico requires this just out of curiosity. It would be wise to check with your local authority before, but from my eperience they do not always interpret codes correctly. I frequently battle inspectors in one city by me and have yet to lose. They try to enforce code without the exemptions and have no local code to overide it.

"What you can get away with for a nickel cheaper should never be up for question when life safety is on the line." Not seeing how a window hung at 5'8" would be a safety issue in a shower, but you have to follow the codes in your area.

IMO no it does not need to be tempered but it does need to have waterproof framing. But I find a lot of codes are in place for the stupidest person possible .