Yes, butter can often be left out overnight, especially salted butter kept in a covered butter dish.
That said, heat, cleanliness, and how long it sits out still matter.
Can you leave butter out overnight?
TL;DR
Yes, usually. Covered salted butter can often sit out overnight, but keep it clean and cool.
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Butter is not the same as milk or cooked leftovers. Salted butter has less water and is less likely to spoil quickly than many dairy foods.
Use a clean covered butter dish and keep it away from heat, sunlight, and dirty utensils. If your kitchen is very warm, the fridge is safer.
Unsalted butter is more delicate and may be better stored cold if you will not use it quickly.
Butter can sit out for short everyday use, but keep it covered and do not leave it in a hot kitchen.
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