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El tiempo está malo hoy.
The weather is bad today.
Bad, evil, or of poor quality
Ese hombre es malo.
That man is bad.
La comida estaba mala.
The food was bad.
Can describe people, things, or situations that are negative or of poor quality.
'Malo' is often used to describe things that are of poor quality or unpleasant.
'Malo' must agree in gender and number with the noun it modifies (e.g., 'malo' for masculine singular, 'mala' for feminine singular, 'malos' for masculine plural, 'malas' for feminine plural).
From Latin 'malus', meaning 'bad'
In some contexts, 'malo' can also mean 'evil' or 'wicked' when referring to people.