We use hace to talk about the weather when we are referring to temperature in degrees or something that suggests temperature. For example:
Hace 37 grados en el sur del país.It is 37 degrees in the south of the country.
Hace 3 grados afuera.It is 3 degrees outside.
Hace mucho calor en el desierto.It is very hot in the desert.
This is the most common way of asking about the weather:
¿Cómo está el tiempo hoy?What is the weather like today?
Never use the verb ser to talk about the weather!
Hay and está are also used to talk generally about the weather, but not specifically about temperature. For this see Using hay, está, or an impersonal verb to talk about the weather.
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