Is standard 5W30 safe for my 2013 Sentra?
What does your owners manual say? What does the oil cap in your engine say?
I think your manual says to use 0W20, NOT 5W30. It also say unapproved viscosities can damage your engine.
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It does
Ironically it says this too 
@Gary13 Give that leftover 5W30 away to someone who needs it. Btw, I think 0W-20 only comes in full synthetic
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There is 0w20 semi-synthetic, sold under the Honda label
I’m just stating that for informational purposes . . . I’m not suggesting OP buy it from the Honda dealer
Napa occasionally has their synthetic oil on sale, as does Costco. I sure as heck wouldn’t pay full price for engine oil. Why pay full price, if you can wait a few months, buy it on sale and stock up?
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Yup!
Every 2 or 3 months, Costco has Mobil-1 on sale for a drastically-reduced price. That is when I stock-up for my friend, whose Rav consumes a qt every 1,000 miles or so.
I stocked up a few months ago, as you did . . . 5w30, 5w20 and 0w20, for the various family cars I service at home