How to Say "thunder" in Spanish
The Spanish word for “thunder” is “trueno” — A2 level. This is a very common word in everyday Spanish.

Examples
El trueno me asustó anoche.
The thunder scared me last night.
Se escuchó un trueno a lo lejos antes de que empezara a llover.
A clap of thunder was heard in the distance before it started to rain.
Los truenos ensordecedores no nos dejaron dormir.
The deafening thunders didn't let us sleep.
Always Masculine
The word 'trueno' is always masculine. You should always use 'el' or 'un' with it, even if you are talking about many of them.
Using 'Hay' for Weather
To say 'it is thundering,' Spanish speakers often say 'hay truenos' (there is thunder) or 'se oyen truenos' (thunders are heard).
Seeing vs. Hearing
Mistake: “Vi un trueno muy brillante.”
Correction: Oí un trueno o vi un rayo. You cannot see a 'trueno' because it is a sound; you see a 'rayo' (lightning).
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