How to Say "sunny side" in Spanish
The Spanish word for “sunny side” is “solana” — B1 level.

Examples
Nos sentamos en la solana para calentarnos un poco.
We sat in the sunny spot to warm up a bit.
Las uvas crecen mejor en la solana de la colina.
The grapes grow better on the sunny side of the hill.
Buscábamos una casa que estuviera en la solana para tener luz todo el día.
We were looking for a house on the sunny side to have light all day long.
Always Feminine
This word is always feminine ('la solana'). Even though it refers to a place, you don't change it to 'solano' unless you are talking about a specific type of wind.
Using 'en' vs 'a'
Use 'en la solana' when you are physically standing in that sunny place, and 'a la solana' when you are moving toward it or placing something there to catch the sun.
Confusing with 'Solano'
Mistake: “El solano de la montaña.”
Correction: La solana de la montaña. 'Solano' usually refers to an easterly wind, not the sunny spot itself.
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