Plain black coffee left out overnight is usually different from coffee with milk or creamer.
The add ins matter more than the coffee itself.
Can you leave coffee out overnight?
TL;DR
It depends. Black coffee is usually okay, but coffee with milk or creamer should not sit out overnight.
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Black coffee may taste stale or bitter after sitting out overnight, but it is not usually treated like a perishable dairy food.
If the coffee has milk, cream, half and half, or dairy based creamer, do not drink it after it sat out all night.
For better flavor, refrigerate leftover coffee if you want to use it for iced coffee the next day.
Black coffee is mostly a taste issue. Coffee with dairy is a food safety issue.
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