How to Say "night air" in Spanish
The Spanish word for “night air” is “sereno” — B1 level.
English → SpanishB1
nounB1
The damp, cool air or mist at night

Examples
No salgas sin abrigo, que el sereno te va a enfermar.
Don't go out without a coat; the night air will make you sick.
Las plantas están mojadas por el sereno.
The plants are wet from the night dew.
Dejaron la ropa afuera y le cayó el sereno.
They left the clothes outside and they got damp from the night air.
Always Masculine
When talking about the night air, this word is always 'el sereno', even if you are a woman talking about yourself getting cold.
Air vs. Person
Mistake: “Thinking 'el sereno' only refers to a person.”
Correction: In most homes, 'el sereno' refers to the cold mist outside at night, not a person.
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