How to Say "sky" in Spanish
The Spanish word for “sky” is “cielo” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
NounA1
The atmosphere above the Earth

Examples
El cielo está azul hoy.
The sky is blue today.
Vimos muchas estrellas en el cielo nocturno.
We saw many stars in the night sky.
El avión volaba por encima de las nubes, en un cielo despejado.
The plane was flying above the clouds in a clear sky.
Always Masculine
'Cielo' is a masculine word, so you always use 'el cielo' (the sky) or 'un cielo' (a sky), never 'la' or 'una'.
Using 'cielo' for 'weather'
Mistake: “El cielo está malo hoy.”
Correction: Hace mal tiempo hoy. While the sky's appearance is part of the weather, Spanish generally uses the verb 'hacer' to talk about what the weather is 'doing'.
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